Direction : What value should come in place question mark(?) in the following questions?

0.75 % of 90 + 0.55 % of 80=?

Find the value of   $$ {(0.75)^3\over1-.75}+[0.75+(0.75)^2+1]$$

The sum of the squares of 2 number is 146 and the square root of one of them is 5. The cube of the other number is 

$$ (17)^{2} + 6 × (13)^{2}-212×6$$

$$\sqrt{x}÷ \sqrt{144} = 0.02, $$ then the value of x is 

Evaluate: $$ {9।3-5।-5।-5।4।÷10\over-3(5)-2×4÷2}$$

In a group of 15 women, 7 have nose studs, 8 have ear rings and 3 have neither. How many of these have both nose studs and ear rings? 

The smallest number that must be subtracted from 1000 to make the resulting number a perfect square is