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A and B can do a piece of work in 10 days and 15 days respectively. A alone starts the work. Then, 5 days after he is joined by B. In how many days, work will be completed ?

B. 8
Posted in:  Time & Work -  Aptitude -  Mathematics

If a + b + c = 0, then (a3 + b3 + c3) is equal to :

C. 3 ABC
Posted in:  Basic Operations & Factorization -  Algebra -  Mathematics

What value will replace the question mark in the following equations ?
->  ? - 1936248 = 1635773

A. 3572021
Posted in:  Numbers -  Arithmetic -  Mathematics

The least prime number is :

C. 2
Posted in:  Numbers -  Arithmetic -  Mathematics

Sound travels at 330 meters a second.
How many kilometers away is a thunder cloud when it`s sound follow the flash after 10 seconds ?

A. 3.3
Posted in:  Time, Distance and Speed -  Aptitude -  Mathematics