Question

There are 27 students in a chemistry class and 22 students in a physics class. Seven of these students take physics and chemistry. What is the ratio of the number of students taking only physics to those taking only chemistry?

(A)4:3
(B)34:29
(C)7:6
(D)3:4
(E)22:27

I suck at ratios =_="

Answer 1

20/15 = 4/3 = 4:3

20/15 because you have 27 in chem and 2 in physics physics, but 7 are taking chem and physics, so 27 - 7= 20 and 22 -7 = 15

Answer 2

Thanks.

Answer 3

yw