Multiple choice

A is thrice as good a workman as B. Together they can do a job in 15 days. In how many days will B finish the work?

  1. 55 days

  2. 45 days

  3. 52 days

  4. 60 days
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A is thrice as efficient as B, so their work rates are 3x and x. Together they complete 4x units per day. In 15 days they finish 60x units of work. B alone would take 60x divided by x = 60 days to complete the same work.

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