Multiple choice

A is twice as good a workman as B and together they finish a piece of work in 13 days. In how many days will B alone finish the work?

  1. 19.5

  2. 39

  3. 21

  4. 42
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If A is twice as efficient as B, let B's 1 day work = x, then A's = 2x. Together they do 3x work daily. In 13 days, total work = 39x units. B alone at x units/day would need 39x/x = 39 days.

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