The number, whose square is equal to the difference between the squares of 975 and 585, is: 

Direction: what should come in place at question mark(?).

$$ {1\over 8}×(223+?)=71$$

What will be the total number of pieces if the length of $$ {5}{1\over4}$$  the rib is cut to 3/4 m length?

The smallest positive integer n for which 864 x n is a perfect cube, is: 

There are some boys and girls in a room. The square of the number of the girls is less than the square of the number of boys by 28. If there were two more girls, the number of boys would have been the same as that of the girls. The total number of the boys and girls in the room are

The smallest 4- digit number which is a perfect square is 

If $${4x^2={15^2-9^2}}$$ then the value of x is

For what value of m will the system of equations 18x-72y+13=0 and 7x-my-17=0 have no solution?