Multiple choice

A and B can complete the work in 15 days. lf A is 50% more efficient than B. How long would A take to complete the work alone?

  1. 25 days

  2. 20 days

  3. 24 days

  4. 22 days
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If A and B together take 15 days and A is 50% more efficient, let B's efficiency = 2x. Then A's efficiency = 3x (50% more). Combined efficiency = 5x per day. Total work = 15 × 5x = 75x. A alone would take 75x/3x = 25 days. Note: There's a typo in the question ('lf' instead of 'if') but the answer is still derivable.

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