Which of the following numbers is divisible by 11?

There are some boys and girls in a room. The square of the number of girls is 28 less than the square of the number of boys. If two more girls join then the number of boys and girls becomes equal, then what is the total number of boys and girls in the room?

The LCM of two numbers is 864 and their HCF is 144. If one of the numbers is 288, the other number is:

The L.C.M and H.C.F of the two numbers are 84 and 21 respectively. If the numbers have a ratio of 1: 4, what is the larger number?

Find the LCM of the fractions $${2\over 5}$$, $${3\over 7}$$ and $${4\over 9}$$

On dividing 256a²b²c² by 64a², we get

The HCF of two numbers is 21 and their LCM is 840. If one of the numbers is 49, then the other number is:

The HCF of three numbers 98, 175 and 210 will be: