Question

Find the missing number:

$\begin{array}{ccc}10& 50& 250\\ 6& 30& 150\\ 4& 20& ?\end{array}$

• A. 120
• B. 50
• C. 100
• D. 200

Answer 1

The correct option is C

100

For the first two rows:

$50÷10=5$ and $250÷50=5$

$30÷6=5$ and $150÷30=5$

So, we observe that in a row:

Number in the second column = 5 $\times$ Number in the first column

Number in the third column = 5 $\times$ Number in the second column

So, 5 $\times$ 4 = 20 and 5 $\times$ 20 = 100

Hence, the missing number is 100.