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A and B together can complete a piece of work in 15 days. A is 150% more efficient worker than B. How long will A take to complete the work alone? 

(a) 20 days 

(b) 21 days 

(c) 21.4 days 

(d) 22.5 days

1 Answer

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Best answer

Correct option (c) 21.4 days

Explanation: 

A : B

efficiency (100+150) : 100%

250 : 100(A+B)

Efficiency 5 : 2=7 units/days

Total work= 15days×7units = 105 

A can complete the whole work in = 105/5 = 21 days

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