A mixture contains milk and water in the ratio 3 : 2. If 4 litres of water is added to the mixture, milk and water in the mixture becomes equal. Find the quantity of milk in mixture in litres.

What value will come in place of question mark($?$) in the following question?

$\sqrt{?} + 5062 = 8563 - 3443$
 

What approximate value will come in place of the question mark (?) in the question given below?
 

$4 \times \frac{3}{13} \times 952 - 128\frac{5}{7} = ?$

What should come in place of question mark $(?)$ in the following question?

$850÷17\times 5+10=?$