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### Question

The ratio of present ages of two monuments A and B is $4{1/5}$. After 4 years later the age of A will be 109 years. What is the present age of B?

**A**

25 years.

**B**

20 years.

**C**

15 years.

**D**

30 years.

**Soln.**

**Ans: a**

The ratio of ages of A and B is given as ${21/5}$, which is same as: $4{1/5}$. So we can write the present ages of A and B, respectively, as 21r and 5r years. 4 years later the age of A is $21r + 4 = 109$ which gives r = 5. The age of B, therefore, is 5r = 5 × 5 = 25 years.