Question

Find the missing number.

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

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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.