If 16 men or 20 women can do a piece of work in 25 days. In what time will 28 men and 15 women do it?A10B12C15D18Answer: A. 10 Read Explanation: You can assume 1 man does 'x' units of work per day and 1 woman does 'y' units of work per day. Then, 16x × 25 = 20y × 25, which gives 16x = 20y, or 4x = 5y. The total work to be done is 16 × 25 × x (or 20 × 25 × y). The work done by 28 men and 15 women in T days is (28x + 15y) × T. Equating the total work: 400x = (28x + 15×(4/5)x) × T ⇒ 400x = (28x + 12x) × T⇒ 400x = 40x × T ⇒ T = 10. Read more in App