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### Question

The ratio of present ages of two monuments A and B is $2{9/10}$. After 4 years later the age of A will be 381 years. What is the present age of B?

**A**

130 years.

**B**

120 years.

**C**

110 years.

**D**

140 years.

**Soln.**

**Ans: a**

The ratio of ages of A and B is given as ${29/10}$, which is same as: $2{9/10}$. So we can write the present ages of A and B, respectively, as 29r and 10r years. 4 years later the age of A is $29r + 4 = 381$ which gives r = 13. The age of B, therefore, is 10r = 10 × 13 = 130 years.