A alone can do piece of work in 12days and B can do same work in 15days. A alone do work for 4 days. Then A and B can do together to finish the work?
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2
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A takes 12 days
B takes 15 days
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A and B = (12 x 15) / ( 12 + 15) = 6 2/3 days
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Answer: They will take 6 2/3 days to finish the work.
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A and B =
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1
Given,
A= 12 Days
B= 15 Days
By using chocolate concept of aptitude,
LCM(12,15)= 60 Chocolates (total work)
One day work of,
A =60÷12= 5 chocolates/day
B =60÷15= 4 chocolates/day
One day work of,
A and B together= 5+4
= 9 chocolates/day
w.k.t, Total No of Days
= (Total work) ÷ (Efficiency of A and B)
= 60 ÷ 9
= 6.67 days (exactly)
= 7 days (approximately)
So, A and B together can do a work in 7 days
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