A number consists of two digits. If the number formed by interchanging the digits is added to the original number, the resulting number (i.e. the sum) must be divisible by

Two numbers, of which the first number is 200% of the second number. If the sum of the squares of the first number and the cube of the second number is 5 times the product of both numbers, find the difference between the two numbers?

The largest natural number which exactly divides the product of any four consecutive natural numbers is

Find the maximum number of students among them 1001 pens and 910 pencils can be distributed in such a way that each student gets the same number of pens and same number of pencils.

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: 

The real number to be added to 13851 to get a number that is divisible by 87 is :

In a class, there are ' z ' students. Out of them ‘x’ are boys. What part of the class is composed of girls? 

The sum of all natural numbers between 100 and 200. Which are multiple of 3 will be: