Question

Replace the ? with an appropriate number.

• A. $78$
• B. $82$
• C. $94$
• D. $86$

Answer 1

The correct option is D $86$

The sum of squares of numbers outside the circle is equal to the number inside the circle, In first figure,
$2^2+2^2+4^2+3^2=4+4+16+9=33$.
In second figure,
$3^2+2^2+5^2+4^2=9+4+25+16=54$.
$\therefore$ In third figure, missing number
$6^2+5^2+4^2+3^2=36+25+16+9=86$.