Noob ratio maths help

Soldato
Joined
26 Jun 2008
Posts
17,181
Location
Wakefield
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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