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Old 29th Oct 2013, 11:16   #1
Lokai
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Noob ratio maths help

Looking for a little assistance with a maths questions for someone that hasn't studied in 18 years -

Taking two figures (380 ppm carbon dioxide and 1750 ppb methane), express the ratio of co2 to ch4 in the format x: 1, where x is a whole number given to two significant figures.

If someone could point me in the right direction it would be greatly appreciated.
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Old 29th Oct 2013, 11:19   #2
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Old 29th Oct 2013, 11:31   #3
dl8860
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If you divide the larger number by the smaller number when both are in equal units, the number you get is the 'x' you are looking for.

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Old 29th Oct 2013, 11:39   #4
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Do Your own Damn Homework!



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Old 29th Oct 2013, 12:07   #5
rubberduck
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1750 ppb = 1.75 ppm

So 380/1.75 = 217.14

So i guess the answer is 217.14 : 1
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Old 29th Oct 2013, 12:13   #6
Lokai
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Great, thanks for your help, i wasn't converting the methane to ppm from ppb which is where i was going wrong.
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Old 29th Oct 2013, 12:17   #7
Freakbro
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Quote:
Originally Posted by rubberduck View Post
1750 ppb = 1.75 ppm

So 380/1.75 = 217.14

So i guess the answer is 217.14 : 1
Except it asks for a whole number to 2 significant figures, not 2 decimal places - which wouldn't be a whole number anyway.

So the answer would be 220 : 1

But well spotted on the ppb I hadn't noticed that
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Old 29th Oct 2013, 12:36   #8
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Old 29th Oct 2013, 14:04   #9
Spunkey
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Quote:
Originally Posted by Freakbro View Post
Except it asks for a whole number to 2 significant figures, not 2 decimal places - which wouldn't be a whole number anyway.

So the answer would be 220 : 1
Doesn't 'significant figures' mean 'integer', not nearest factor of 10? I made the answer 217:1

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Old 29th Oct 2013, 14:22   #10
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Quote:
Originally Posted by Spunkey View Post
Doesn't 'significant figures' mean 'integer', not nearest factor of 10? I made the answer 217:1
No, significant figures means just that, the first set of numbers starting with one that is not zero, then you round up as normal.

So 655,464 to 3 significant figures would be 655,000
to 2 significant figures would be 660,000
and to 1 significant figure would be 700,000
Last edited by Freakbro; 29th Oct 2013 at 14:26.
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Old 29th Oct 2013, 15:02   #11
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