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- A does 4/5 of a work in 20 days.
Question 1:
A does 4/5 of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days.How long B alone would take to do the whole work?
A. 23 days
B. 37 days
C. 40 days
D. 37 1/2 days
Feedback A alone can finish the work in 20 × 5/4 days = 25 days
A’s 1 day’s work = 1/25
A and B together can finish the whole work in 5 × 3 days = 15 days
Their 1 day’s work = 1/15
Therefore, B’s 1 day’s work = 1/15 – 1/25 = 1/37 ½
Therefore, B alone can finish the whole work in 37 ½ days
A’s 1 day’s work = 1/25
A and B together can finish the whole work in 5 × 3 days = 15 days
Their 1 day’s work = 1/15
Therefore, B’s 1 day’s work = 1/15 – 1/25 = 1/37 ½
Therefore, B alone can finish the whole work in 37 ½ days
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