When a positive integer n is divided by 5 the remainder is 2. What is the remainder when the number 3n is is divided by 5 ?

many times will the buttons of a typewriter be pressed to write the numbers 121 to 1346?

On adding a natural number P to the product of four consecutive natural numbers we get a perfect square number. The minimum value of P is:

The average of six consecutive odd numbers is 26. Find the difference between the largest and the smallest of these numbers.

What will be come in place of question mark(?) in the following number series?
8,  14, 25, 46, 82 , ?

The third proportional of two numbers 9 and  24 is

The sum of three consecutive numbers is 87. The middle number is : 

A man spends  $${1\over 3}$$ of his income on food,   $${2\over 5}$$  of his income house rent and   $${1\over 5}$$ of his income on clothes. If he still has Rs. 400 left with him, his income is: