Question

Find the correct alternative which will replace the question mark (?).

• A. $12$
• B. $15$
• C. $18$
• D. $9$

Answer 1

Answer: (B)

$15$

From first figure, $31+19+17+54=121={11}^2$. So, middle number is $11$.

From second figure, $27+62+37+43=169={13}^2$. So, middle number is $13$.

Similarly, in third figure

$41+38+72+74=225={15}^2$.

Thus, $15$ replaces question mark.