Question

Find the missing number.

$$\begin{array}{ccccc}X& 30& 35& & 45\\ Y& 42& 49& 56& 63\end{array}$$

__

Answer 1

Observing the table,

let the missing number be x

$\frac{30}{42}$ = $\frac{35}{49}$ = $\frac{x}{56}$ = $\frac{5}{7}$

Therefore x=40