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Author Topic: Maths doubt ~~  (Read 6309 times)

Offline sameer210394

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Maths doubt ~~
« on: October 27, 2009, 04:33:05 pm »
A cylindrical glass has a radius of 4 cm and a height of 6 cm.
A large cylindrical jar full of water is a similar shape to the glass.
The glass can be filled with water from the jar exactly 216 times.
Work out the radius and height of the jar.


i got the answers as r = 24 &  h=36

but the mark scheme says the answer is r=14, h=42.


wat is the method to solve it correctly.
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Offline astarmathsandphysics

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Re: Maths doubt ~~
« Reply #1 on: October 27, 2009, 04:43:56 pm »
Quote from: sameer210394 on October 27, 2009, 04:33:05 pm
A cylindrical glass has a radius of 4 cm and a height of 6 cm.
A large cylindrical jar full of water is a similar shape to the glass.
The glass can be filled with water from the jar exactly 216 times.
Work out the radius and height of the jar.


i got the answers as r = 24 &  h=36

but the mark scheme says the answer is r=14, h=42.


wat is the method to solve it correctly.

The volume of the har is 216 times the volume of the glass
so all the lengths on the hjar are cube root(216)=6 times the lengths on the glass
radius is 24 and height=36
 
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Offline astarmathsandphysics

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Re: Maths doubt ~~
« Reply #2 on: October 27, 2009, 04:44:29 pm »
I saw this question before. Which papaer is it from?
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Offline wassup

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Re: Maths doubt ~~
« Reply #3 on: October 27, 2009, 04:47:12 pm »
Quote from: sameer210394 on October 27, 2009, 04:33:05 pm
A cylindrical glass has a radius of 4 cm and a height of 6 cm.
A large cylindrical jar full of water is a similar shape to the glass.
The glass can be filled with water from the jar exactly 216 times.
Work out the radius and height of the jar.


i got the answers as r = 24 &  h=36

but the mark scheme says the answer is r=14, h=42.


wat is the method to solve it correctly.

ur ans. is correct acc. 2 me. u must hav seen d wrong mark scheme.
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Offline sameer210394

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Re: Maths doubt ~~
« Reply #4 on: October 27, 2009, 04:47:44 pm »
Quote from: astarmathsandphysics on October 27, 2009, 04:44:29 pm
I saw this question before. Which papaer is it from?

maths paper 2 may/june- question 10)

0580/22/M/J/08
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Offline holychalice

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Re: Maths doubt ~~
« Reply #5 on: October 27, 2009, 04:49:46 pm »
check d ms again its 24 nd 36 ...
u hav checked d mark scheme of first variant . while ur doin second variant
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Offline sameer210394

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Re: Maths doubt ~~
« Reply #6 on: October 27, 2009, 04:49:51 pm »
Quote from: wassup on October 27, 2009, 04:47:12 pm
ur ans. is correct acc. 2 me. u must hav seen d wrong mark scheme.

o yehh... i saw variant 1 my bad...
Thanks any ways...
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Offline wassup

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Re: Maths doubt ~~
« Reply #7 on: October 27, 2009, 04:51:40 pm »
manbir v r doing d second variant na??
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Offline holychalice

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Re: Maths doubt ~~
« Reply #8 on: October 27, 2009, 04:52:51 pm »
ya .. 0580/22
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Offline wassup

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Re: Maths doubt ~~
« Reply #9 on: October 27, 2009, 04:54:39 pm »
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Offline sameer210394

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Re: Maths doubt ~~
« Reply #10 on: October 27, 2009, 04:54:45 pm »
Quote from: M.@.N.B.i.R. on October 27, 2009, 04:52:51 pm
ya .. 0590/22


so all u guys ready to get your A* in Maths -  ;)

i think this time too the global topper will be from india, last paper it was a girl from bangalore...
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Offline holychalice

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Re: Maths doubt ~~
« Reply #11 on: October 27, 2009, 04:57:05 pm »
kinda hoping for it ....
but dat depends on d pprs we get ...
Best of luck !!
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Offline wassup

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Re: Maths doubt ~~
« Reply #12 on: October 27, 2009, 04:58:24 pm »
Quote from: sameer210394 on October 27, 2009, 04:54:45 pm
so all u guys ready to get your A* in Maths -  ;)

i think this time too the global topper will be from india, last paper it was a girl from bangalore...

I wonder how do they decide global topper as there can be more than 1 for maths ??? ???
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Offline astarmathsandphysics

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Re: Maths doubt ~~
« Reply #13 on: October 27, 2009, 04:59:37 pm »
Global topper was the person with the highest mark? There must be quite a few with 100%
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Offline wassup

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Re: Maths doubt ~~
« Reply #14 on: October 27, 2009, 05:00:49 pm »
Quote from: astarmathsandphysics on October 27, 2009, 04:59:37 pm
Global topper was the person with the highest mark? There must be quite a few with 100%

ya, that's what...how do they decide whoz gonna b d topper?
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