Find the value of given expression.

3 – (– 6) {– 2 – 9 – 3} ÷ 7{1 + (– 2) (– 1)}

If 3x + 7y=75, 5x- 5y= 25, then the value of (x +y)=?

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

$$ {1\over 8}×(223+?)=71$$

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

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

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

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

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