Multiple choice

A is 50 percent more efficient than B. If the two persons can complete a piece of work in 30 days working together, in how many days can A complete the work working alone?

  1. 15

  2. 20

  3. 75

  4. 50

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A is 1.5 times as efficient as B. Let B's efficiency be 1 unit/day, A's is 1.5. Together they do 2.5 units/day. Total work = 2.5 * 30 = 75 units. A alone takes 75 / 1.5 = 50 days.