Multiple choice

A can do a piece of work in 70 days and B is 40% more efficient than A. The number of days taken by B to do the same work is-

  1. 40 days

  2. 60 days

  3. 50 days

  4. 45 days
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If A takes 70 days and B is 40% more efficient, then B's efficiency is 140% of A's efficiency (or 1.4 times A). Time is inversely proportional to efficiency. So B's time = A's time / 1.4 = 70 / 1.4 = 50 days. Option C is correct.

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