Question

What number should replace question mark?

• A. $75$
• B. $26$
• C. $25$
• D. $20$

Answer 1

Answer: (B)

$26$

The lower number is obtained by adding the square of the upper two numbers. Thus,
In fig. (A), $2^2+4^2=20$
In fig. (B), $3^2+9^2=90$
$\therefore$ In fig. (C), missing number $=1^2+5^2=26$