Correct Answer - Option 5 : 16

**Given:**

Number of days 12 men take to make 5 cycles = 10 days

**Concept used:**

(M_{1} × D_{1} × H_{1})/W_{1} = (M_{2} × D_{2} × H_{2})/W_{2}

**Calculation:**

(12 × 10)/5 = (15 × D_{2})/10

⇒ D_{2} = (12 × 10 × 10)/(15 × 5) = 16 days

**∴ The number of days in which 15 men can make 10 cycles is 16 days. **