What mathematical operation should come at the place of ‘?’ in the equation:
2 ? 6 – 12 ÷ 4 +2 =11.

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

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

1-[5-{2+(-5+6-2)2}] is equal to 

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

45% of 224×?% of 120=8104.32

If $$ {3\sqrt{{1-a}\over{a}}}+9={19-3\sqrt{{a}\over{1-a}}}$$, then what is the value of a?

$$ { \sqrt{(0.798)^2+0.404×0.798+(0.202)^2}+1=?} $$

The smallest natural number, by which 3000 must be divided to make the quotient a perfect cube, is :