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kuldeep barwal

· started a discussion

· 1 Months ago

trick (Question: 209599.0 )

give some tricks . its so lengthy

Question:
A, B and C complete a work in 10, 12 and 15 days respectively. They started the work together. But A leaves the work before 5 days of its completion. B also leaves the work 2 days after A leaves. In how many days will the work completed ? 
Options:
A) 4 days
B) 6\(\cfrac{2}{3}\) days
C) 7 days
D) 8 days
Solution:
Ans: (c)


C is work alone for 3 days = 4 × 3 = 12

Remaining work = 60 - 12 = 48

B + C is work for 2 days = 9 × 2 = 18

Remaining work = 48 - 18 = 30

A + B + C are finished the remaining work for = 30/15 = 2 days

Total days = 3 + 2 + 2 = 7 days

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