MBA Exam

Out
of 100 schools in a town, the number of schools having a playground was
30, and all these schools had neither a library nor a laboratory. The
number of schools having a laboratory only was twice the number of those
having a library only. The number of schools having a laboratory as
well as a library was one-fourth the number of those having a laboratory
only. The number of schools having either a laboratory or a library or
both was 35.
How many schools had none of the three, viz. laboratory, library or playground?

1) 20
2) 5
3) 30
4) 35
5) 40

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MBA Other Question
Ram takes 30 seconds to move down in a moving escalator (moving downward). He takes thrice the time to move up the same escalator. In how much time does the escalator take him down?

1) 1 min. 30 sec.
2) 45 sec.
3) 1 min. 45 sec.
4) 1 min 15 sec.
 How many pairs (a, b) such that both a and b are non-zero exist if a and b are the roots of x2 + ax + b = 0 ?

1) 1
2) 2
3) 3
4) 4
5) none