Question

In each of the following question, select the related number from the given alternatives.
$6$ $:$ $12$ $:$ $:$ $20$ $:$ $?$

• A. $50$
• B. $30$
• C. $42$
• D. $38$

Answer 1

Answer: (B)

$30$

First part of analogy $6:12$

$6=2^2+2$

$12=3^3+3$

Similarly for second part $20:?$

$20=4^2+4$

$?=5^2+5=30$

$6:12::20:30$

So option B is correct