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

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

0.75 % of 90 + 0.55 % of 80=?

The value of $$ {\sqrt{0.6912}+{\sqrt{0.5292}}\over {\sqrt{0.6912}-{\sqrt{0.5292}}}}$$ is:

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

3x² = 36 then what is the value of x?

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

1-[5-{2+(-5+6-2)2}] is equal to 

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