62= 12+c
Which your answer is 50 cause if you take 62 and subtract it to 12 it's 50. So 50 + 12 = 62
So the ratio of boys to girls is 12:24.. now, is that an equivalent ratio as 2 boys for 4 girls? or 2:4? let's see.

you could start simplifying the 12/24 fraction by dividing by some common multiple, say 2, and get 6/12, then divide by 3 and get 2/4 and stop there.
then you'll notice that 12/24 is really 2/4 in disguise.
The possibility is 3 : 1/2 * 6/1 = 3/1
(last part)
25%
27.8%
290%
300%
67%