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MATH TEST HELP!
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Finland King_Of_Finland 
I need help with my math test. So the question is this: There are is some kind of drink being sold in two differently sized bottles. The first bottle is 0.5l and the second one is 1.5l. The height of the first bottle is 34cm and the bottles are similiar so how can I calculate the height of the second bottle?
2020-04-01 10:47
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bump
2020-04-01 10:48
Just 1v1 your math teacher
2020-04-01 10:49
rofl
2020-04-01 11:29
proportion?
2020-04-01 10:49
All of the proportions should stay the same or something like that.
2020-04-01 10:51
its too hard mens
2020-04-01 10:53
#48
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Ukraine Shimon4ik 
0.5/1.5 = 34/x
2020-04-01 11:20
#65
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Finland mattixboi 
no
2020-04-01 11:31
#84
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Ukraine Shimon4ik 
Why not?
2020-04-01 12:39
#85
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Finland mattixboi 
just think of the case in real life, would that bottle be over a meter in height?
2020-04-01 12:49
#87
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Ukraine Shimon4ik 
34cm for 0.5l bottle doesn't sound too real too
2020-04-01 12:54
#90
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Pakistan MeMeMeisteR2 
+1 lmao wtf was it a baseball bat shaped bottle
2020-04-01 12:57
#93
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Finland mattixboi 
the height would 3x only if the area of the bottom stayed the same, but it grows as well
2020-04-01 15:41
do we count bottle as a cylinder ?
2020-04-01 10:50
I guess so
2020-04-01 10:50
well anyway its 34*3 = 102 cause cylinder volyme is pi*r^2*h(height) and iftheir base is equal then height of the second bottle = (1.5/0.5)*34
2020-04-01 10:52
34cm •3? Idk I’m bad at math
2020-04-01 10:50
Nope that would a lot more than 1.5l since the width also changes.
2020-04-01 10:51
if the width changes then its too hard xD
2020-04-01 10:53
Ok ty anyways!
2020-04-01 10:54
what grade are you on?
2020-04-01 10:52
First year in high school. Didn't do anything related to math in the last month since I got lazy and thought I could just google lmao
2020-04-01 10:53
#18
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Finland pate1 
long or short math?
2020-04-01 10:58
lonk
2020-04-01 10:58
with a ruler
2020-04-01 10:52
Bro if you're having issues with such questions you should reconsider your schedule and focus on studying math lol
2020-04-01 10:54
But can you count to 10? I don't think so
2020-04-01 10:55
Post a pic of the problem fam
2020-04-01 11:00
2020-04-01 11:03
And those arent just squares but easier to draw it since the question didnt have a picture ready for me. I guess cylinders count as bottles
2020-04-01 11:04
#22
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Libya s1v9mple 
Either you're good at math, or you aren't.
2020-04-01 11:01
#20
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Yugoslavia seeeed 
The height should be just 34*3 if the width dooesnt change. If it does then you would need to know the other width too iirc. So 102 is probs the correct answer. Or im being extremelly stupid rn. Which is probs the case
2020-04-01 11:00
#42
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Yugoslavia seeeed 
Yep im fucking dumb. Did it on papr its 49
2020-04-01 11:11
i got the same.
2020-04-01 11:25
Pretty sure height is approximately 49. I am on mobile so I can't type my shit. Will write it on paper and upload image.
2020-04-01 11:08
2020-04-01 11:08
Ty!!!
2020-04-01 11:09
why dya put x in front of r and h on the second line?
2020-04-01 11:30
#67
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Finland mattixboi 
it's the ratio of the length change between the bottles
2020-04-01 11:36
you can solve it way easier #47
2020-04-01 11:36
47 doesn't show up as a comment, posted from new account?
2020-04-01 11:43
not really, but if you scroll slightly below this comment you'll find it.
2020-04-01 11:45
nvm it's shown up now
2020-04-01 11:46
1L = 500cm^3 ............... lengthcube = third root of 500cm^3 = 7,937 1.5L = 15000cm^3 ................. lengthcube = third root of 1500cm^3 = 11,447 ratio 11,447: 7,937 = 1,442 HEIGHT 34cm x 1,442 = 49,028cm
2020-04-01 11:46
I agree it's a faster method, and I understand the logic behind it. That being said, it might not be inherently clear to the OP how you got to the answer. When someone asks for help I like to put it in a simple to understand format so they can learn from it, instead of giving my optimal solution path.
2020-04-01 11:54
dude be on an exam and gets his phone out TO ASK HLTV
2020-04-01 11:03
I'm at home since the schools are closed and hltv top 1 place to ask anything
2020-04-01 11:05
there was a study on hltv and the average iq is 124
2020-04-01 11:27
#27
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Libya s1v9mple 
Jesus, it took me like 5 minutes to figure this out. Fucking brain fog
2020-04-01 11:03
are you a 4th grader or what?
2020-04-01 11:04
#33
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Libya s1v9mple 
I could barely solve it and I usually do well in math classes, just some days (or months) one's brain just doesn't work, it's really unpleasant, so please don't be so quick to judge
2020-04-01 11:06
#30
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Serbia Cosa_The_Serb 
102cm is the logical answer , but if width changes then shit idk
2020-04-01 11:05
Yeah the width changes since the proportions should stay the same so its not 102 :/
2020-04-01 11:06
#34
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China cescy8 
V1/V2=1/3 (pi*r1^2*h1) /(pi*r2^2*h2) =1/3 (r1^2*h1) /(r2^2*h2) =1/3 if h1/h2=k, then k^3=1/3 k=(1/3)^(1/3) h2=h1/k=h1*(3)^(1/3)=34*(3)^(1/3) cm
2020-04-01 11:07
#52
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China cescy8 
why is this correct answer ignored lol
2020-04-01 11:24
#68
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Finland mattixboi 
hard to read that, but ye its correct
2020-04-01 11:38
#35
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Libya s1v9mple 
And yes, this is an April 1 joke, took my demented shitty brain this long to figure it out
2020-04-01 11:07
Just think yourself or ask a relative don’t come here to ask
2020-04-01 11:08
#38
KRIMZ | 
Finland Alvohaga 
Lol it's etäopetus, just look at book mens. 😎
2020-04-01 11:08
Don't know where to for it lmao didnt open the book for a month
2020-04-01 11:09
wtf you have tests during corona ?
2020-04-01 11:09
#44
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Serbia Cosa_The_Serb 
We in Serbia do too , fucking dogshit country I can't wait to gtfo of here
2020-04-01 11:14
#43
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Russia SW@G_2 
Idk if you still need help but you should do it ?"cross" style? 0.5 = 34 1.5 = x x = (1.5*34)/0.5 = 102 Also you could just multiply 34 by 3 because 1.5/0.5=3
2020-04-01 11:13
Already got the help and since the porportions should stay the same / width changes too when the heigh changes its not 102
2020-04-01 11:15
#69
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Russia SW@G_2 
My bad sorry. Makes the problem more interesting
2020-04-01 11:42
V of bottle is 2x*h , first bottles V=2x*0.34, r is density r=m/V, the drink is the same so r1=r2, m1/V1=m2/V2, 0,5/2x*0.34=1,5/2x*h , h=0.34*1,5/0,5= 1.02m‬, The height of the second one is 1.02m, if the proportions are not the same instead of x put in the proportions that it gives you.
2020-04-01 11:15
1L = 500cm^3 ............... length = third root of 500cm^3 = 7,937 1.5L = 15000cm^3 ................. length = third root of 1500cm^3 = 11,447 ratio 11,447: 7,937 = 1,442 HEIGHT 34cm x 1,442 = 49,028cm given its a real bottle and not just a cylinder and the proportions stay the same.
2020-04-01 11:28
#82
chrisJ | 
Germany mosstt 
ooh i like your approach I did it different but our results match.
2020-04-01 12:15
you can check #37. its more mathematical. but this is the most efficient.
2020-04-01 12:16
Not sure but The formula to find the volume (or litres) of a cylinder is V(bottle) = pir^2h, where h is the height of the bottle (in metres) and r is the radius. For 1st bottle, 0.5 = pir^2 x 0.34 Gotta rearrange to find for 'r' 0.5/0.34 = pir^2 (0.5/0.34)/pi = r^2 square-root((0.5/0.34)/pi) = r Therefore, r = ‭0.68418036642371736800657643239874‬ Now, we want to find the height of the second bottle, so we have to rearrange V(bottle) = pir^2h to find h. So, V(Bottle)/(pi(r^2)) = h We know the V is 1.5 and r is the same as before, so just plug in the numbers: 1.5/(pi(0.68418036642371736800657643239874‬^2)) = 1.02 The second bottle is 1.02 metres high, or 102 centimetres :)
2020-04-01 11:22
that would mean no changes in width. but he says the proportions stay the same. so the bottle changes the same ratio in height and width. your r gets bigger.
2020-04-01 11:23
no idea then
2020-04-01 11:24
Yup basically what I did, but some people are saying its 49cm and they are right
2020-04-01 11:24
#47
2020-04-01 11:25
yes
2020-04-01 11:30
Thanks to everyone who helped me or tried to help me even if your answer was not the correct one! I have the question now done and I'll at least pass this class.
2020-04-01 11:28
Thanks I've realised how much NZ education sucks because I've finished high school and have no idea how to solve this and I was pretty good in math class
2020-04-01 11:29
#60
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Russia Ingushetia 
I don't know math isn't my strongest subject.
2020-04-01 11:28
#64
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Netherlands toothpaste 
Write down the formulas then substitute
2020-04-01 11:31
#71
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Czech Republic LidoOP 
radius of base r = square root x ( 500 / 34 Pi ) in centimetres than you have V = Pi x h x r2 height h = V / ( Pi x r2 ) h = 1500 / ( Pi x r2 ) or just multiply height by 3
2020-04-01 11:44
#78
chrisJ | 
Germany mosstt 
they have to be similiar
2020-04-01 11:56
so ez haha dog bullshit motherfucker asslick wanker
2020-04-01 11:50
#77
chrisJ | 
Germany mosstt 
I would assume that the bottle is just a cylinder a) calculate its radius (0.5l bottle) b) upscale the cylinder til it reaches a volume of 1.5l (upscale the height and radius in the same proportions) should be doable with an equation how did you do it?
2020-04-01 11:55
#81
chrisJ | 
Germany mosstt 
It didnt leave me in peace, so I calculated a height of 49,02 cm.
2020-04-01 12:13
#79
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Finland 27HM72 
Lukion koeviikko cheat. :D Always trust hltv
2020-04-01 11:57
#80
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Finland KieZuZ 
I read 'meth' and immediately came here to help fellow men with their business but nvm
2020-04-01 12:06
bruh imagine actually studying hahahaha, studying won't get you anywhere in life
2020-04-01 12:56
LMAO
2020-04-01 13:03
ahahhaha I'm not even talking about NA education, biggest scam in the whole world, even studying in countries like germany is stupid
2020-04-01 13:03
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