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MBA Exam

A,B & C had to paint 3 similar fences. On1st day A turned up for work and complted work on 1st fence in 'm' hrs. On 2nd day,all 3 turned up for work and completed work on 2nd fence in 'm-4' hrs. On 3rd day B&C; turned up for work and completed work on 3rd fence in 'm+5' hrs. Find 'm'

1) 8
2) 9
3) 6
4) 10
5) Cannot be determined

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MBA Other Question
I kno its easy but still nt getting ans Two boxes,1 box containts 2 black ball and 2 white balls,2nd box contains 4 black and 12 white balls.If a box is choosen randomly and two balls are drawn at randomly from it,what is the probability of atleast one ball being black.?

1) 11/20
2) 43/120
3) 77/120
4) 9/20
 A number N = (5^x)×y is the product of twenty consecutive three-digit numbers. If x and y are positive
integers, what is the maximum possible value of x?

1) 6
2) 7
3) 8
4) 9