Question

Find appropriate number for the fourth place.

$25:81::36:?$.

• A. $121$
• B. $100$
• C. $116$
• D. $125$
• E. $144$

Answer 1

The correct option is B $100$

Logic for the above terms is $x^2:(x+4{)}^2$

$5^2=25$
$(5+4{)}^2=9^2=81$
same as
$6^2=36$
$(6+4{)}^2={10}^2=100$

Hence the correct answer is option $B$.