If 1.5 a=0.04 b then $$ {b-a\over b+a}$$.

If  $$\sqrt{2}=1.414$$, the value of $${ \sqrt{2}-1\over\sqrt{2}+1}$$  is nearest to 

Find the value of given expression.

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

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

0.75 % of 90 + 0.55 % of 80=?

By what least number should 4320 be multiplied so as to obtain a number which is perfect cube? 

Find the value of $$ {5^{1\over2}-[3^{1\over4}+6-4÷2]}$$

On simplification of   $$ {(2.664)^2-(2.356)^2\over0.288}$$

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