Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2:16. Approximately how many grams of oxygen are there in 144 grams of water?
2 parts hydrogen 16 parts oxygen=18 Total parts
2x+16x=18x---->144/18, x=8 8*16=128 parts oxygen
Thanks = +1 Kudos
Study from reliable sources!!
Thursdays with Ron: http://www.manhattangmat.com/thursdays-with-ron.cfm
Gmat Prep Questions: