Quantitative Aptitude Ratio and Proportion Age

The respective ratio between the ages of A, B and C is 2 ∶ 3 ∶ 5. If the average of their present ages is 70 years then what would be the difference in ages of B and C 10 years ago?

1

52 years

2

63 years

3

42 years

4

21 years

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