MBA Exam

Aman, Baman and Chaman can finish a job working alone in 15, 20 and 25 days respectively.However, while working with somebody the efficiency of Aman, Baman and Chaman reduces by 30%, 20% and 50% respectively. If none of them is allowed to work for three consecutive days, then what is the maximum possible fraction of the job that they can complete in four days?

1) 1/3
2) 3/10
3) 8/25
4) 17/50
5) 19/50

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MBA Other Question
A - set of natural numbers such that:1) each element gives remainder 2 when divided by 42) each element is divisible by 11 & not 13.The no. of elements in set A are:

1) 15
2) 17
3) 19
4) 18
 If 12 men and 15 boys can do a piece of work in 10 days. Then in how
many days can 15 men and 25 boys do thrice of this work , it being given
that 3 men can do as much work in 2 hours as 5 boys can do in 3 hours.

1) 20 days
2) 25 days
3) 21.6 days
4) 26 days