Question

In the following question, select the related number from the given alternatives.
$12$ $:$ $20$ $:$ $:$ $?$

• A. $15$ $:$ $37$
• B. $16$ $:$ $64$
• C. $27$ $:$ $48$
• D. $30$ $:$ $42$

Answer 1

The correct option is D $30$ $:$ $42$

Observing the relation $12:20$

we can see that average of $12$ and $20$ is $16$ which is a perfect square of $4$.

Only option D satisfies this relation

Average of $30$ and $42$ is $36$ which is a perfect square of $6$.