The present age of Babu is 6 times the present age of Ballu. Four years from now, Babu's age will be 5 times Ballu's age. What will be Babu's age after 15 years?

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**Solution:**

1. Let the present age of Ballu be *x* years.

2. Then, the present age of Babu is *6x* years (since Babu is 6 times Ballu's age).

3. After 4 years, Ballu's age will be *x + 4* and Babu's age will be *6x + 4*.

4. According to the problem, at that time, Babu's age will be 5 times Ballu's age:
   
   $$6x + 4 = 5(x + 4)$$

5. Simplify the equation:

$$6x + 4 = 5x + 20$$

$$6x - 5x = 20 - 4$$

$$x = 16$$

6. So, Ballu's present age is 16 years.

7. Babu's present age is:

$$6 	imes 16 = 96 	ext{ years}$$

8. After 15 years, Babu's age will be:

$$96 + 15 = 111 	ext{ years}$$

**Answer:** 111 years

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