Question

The present ages of 'P', 'Q' and 'R' are in the ratio 2:5:7. The age difference between 'P' and 'R' is 20 years. After 'm' years, age of 'Q' will be 50% more than that of 'P'. Find the value of 'm'.

A 10
B 20
C 16
D 21
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