MBA Exam

there are 4 pipes A,B,C,D. Two are filling pipes and the other two are emptying pipes. the time taken by each pipe to empty/fill tank completely is 10,15,20,30 hours. The tank is filled in 12 hours when all the pipes are used together. Identify the filling pipes...

1) A,B
2) A,C
3) B,C
4) C,D

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MBA Other Question
A stamp collector decides to put all his stamps in a new album. If
he puts 20 stamps on one sheet, there will be some left over; if he puts
23 stamps on a sheet, there will be at least one empty sheet left in
the album. If the stamp collector is presented with an additional new
album of the same kind, each sheet holding 21 stamps, he will be left
with a total of 500 stamps. How many sheets are there in the first
album?

1) 11
2) 12
3) 13
4) 10
5) data insufficient
 There are three points – P, B and Q – on the ground, in a straight line, with a pole AB, at B, such that the pole AB is leaning away from P and towards Q. If B is 20 m away from both P and Q, and the angles of elevation of the top of the pole as observed from P and Q are 30° and 60° respectively, find the length of the pole.

1) 20 m
2) 10Root3
3) 10
4) Cannot be determined