Multiple choice

A can do half of a piece of work in 1 day, whereas B can do full. B can do half the work as C in 1 Day. The ratio of their efficiencies of work is.

  1. $2 : 4 : 1$
  2. $2 : 1 : 4$
  3. $4 : 2 : 1$
  4. $1 : 2 : 4$
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D Correct answer
Explanation

A does 1/2 work in 1 day, so A's rate = 1/2. B does full work in 1 day, so B's rate = 1. B does half work as C in 1 day, meaning C does twice what B does, so C's rate = 2. Efficiency ratio A:B:C = 1/2 : 1 : 2 = 1:2:4.

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