Question

If 5 = 23 and 9 = 79, then 12 = ?
(1) 145 (2) 142
(3) 144 (4) 146

Answer 1

Solution:

Just think about the logic

If 5 = 23

it can be interpreted as
$5 \times 5 - 2 = 25 - 2 = 23$
Now check whether it is true for second term

$9 = 79 \\ \\ = 9 \times 9 - 2 \\ \\ = 81 - 2 = 79$
So,logic is right.

For 12=?
$= 12 \times 12 - 2 \\ \\ = 144 - 2 \\ \\ 12 = 142$
Option (2) is correct answer.

Hope it helps you.