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?

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. 7:0

D. None of these

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