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Maths Puzzle
A can do a price of work in 40 days. He worked at it for 5 days. Then B alone finished it in 21 days. The number of days that A and B together take to finish the work is.
(1) 15 (2) 14 (3) 13 (4) 10
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- A completed 5/40 = 1/8 work.
B completed 7/8 work in 21 days
B completes complete work in 21*8/7 = 24 days.
One day work of (A+B) = 1/40 + 1/24 = 8/120 = 1/15
A and B together complete the work in 15 days. - 12 years agoHelpfull: Yes(1) No(0)
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