Find the value of ‘?’ in the following question?

$\frac{1}{4}\times{\frac{1}{5}}\div{\frac{1}{8}}+\frac{4}{5}\times\frac{1}{2}\div\frac{2}{3}=?$

There are total 200 students in a school, of which $\frac{2}{5}$ th are boys. Find the number of girls in the school.

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

$\frac{6}{2}\times\frac{10}{2}\div{\frac{6}{2}}\times{\frac{6}{2}}\times{6^2}=?$

$\frac{189}{135}$ when written in the simplest form is:

Convert $0.\bar{6}$ into a fraction:

Simplify: $7\frac{1}{5}\div1\frac{1}{35}\times\frac{3}{35}$

Simplify:

$(\frac{1-1}{10})(\frac{1-1}{11})(\frac{1-1}{12})-(\frac{1-1}{99})(\frac{1-1}{100})=?$

The sum of $\frac{5}{11} and\frac{11}{5}$ is:

If $\frac{a}{b}=\frac{1}{3}$ ; $\frac{b}{c}=\frac{1}{2}$ and a = 2 then the value of c is:

In a garden 42 trees, $\frac{3}{7}$ of them are Neem trees and the rest are Mango trees. Find the number of Mango trees.

x and y, given correct to 1 decimal place are given as 6.5 and 1.3 respectively. What is the upper bound of the value of $\frac{x}{y}?$

The sum of $\frac{5}{12} and \frac{12}{5}$ is:

Find the value of $\frac{\frac{4}{9}}{12}$

Find:

$\frac{3}{5}+\frac{3}{7}=?$

How much does one need to add to $\frac{2}{3}$ to obtain $\frac{3}{2}?$

$\frac{1}{3\times5}+\frac{1}{5\times7}+......+\frac{1}{13\times15}=?$

$\frac{1}{5\times6}+\frac{1}{6\times7}+........ + \frac{1}{15\times16}=?$

Simplify: $(\frac{2}{9} + \frac{3}{5})÷ (\frac{2}{9} +\frac{ 2}{5})$

$Compute: (50 + 0.5\times20)\div0.7$

$4\frac26\div1\frac26=$

$(0.05)^2\times\frac1{20}=$

$\frac{1.7\times0.0028}{0.068\times0.014}=$