Question 365451
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Hi, 
Let x represent the # of carbon atoms.  then (36-x) would represent the # of oxygen atoms
Question states
{{{(x/(36-x)) = (1/2)}}}
cross multiply to solve
2x = 36-x
3x = 36
x = 12, the # of carbon atoms, therefore, 24 (36-12) would be the number of oxygen atoms
checking our answer
12/24 = 1/2