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Home / Aptitude Tests / Mathematics / Given that p:q = \(\...
Given that p:q = 13:12 and q:r = \...

Given that p:q = 13:12 and q:r = 25, find p:r

A.

4:105

B.

7:15

C.

20:21

D.

2:35

E.

3:20

Correct answer is B

p:q=13:12

pq=23

2q=3p...(1)

q:r=25:47

qr=25×74=710

10q=7r...(2)

Eliminating q, we have

(1) : 2q=3p

10q=15p

15p=7r

p : r = 7 : 15