Manoj gave 60% of his salary to his wife and invested rest amount in mutual funds. His wife spends 30% amount on grocery and 20% on rent. From remaining amount, she purchased gold worth Rs. 18000. Find salary of Manoj.

Everybody in a room shakes hands with everybody else. The total number of hand-shakes is 55. The total number of persons in the room is:

If four coins are tossed together, what is the probability of at least getting 2 heads?

The difference between the interior and exterior angles at a vertex of a regular polygon is 150°. The number of sides of the polygon is

In an exam, the average marks obtained by the students was found to be 60. After omission of computational errors, the average marks of 100 candidates had to be changed from 60 to 30 and the average with respect to all the examinees came down to 45 marks. The total number of candidates who took the exam, was. 

The sum of the squares of three numbers is 532 and the ratio of the second and also of the second to the third is 3 : 2 . What is the second number?

A man crosses a diagonal of square in two minutes at the speed of 6 km./hr. Find the area of the square-

At what time between 5.30 and 6 will the hands of a clock be at right angles?