Question

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.

4 + 25 = 81; 9 + 49 = 256; 7 + 16 = ?

1. 121
2. 256
3. 16
4. 88

Answer 1

Correct Answer - Option 1 : 121

The logic follows here is;

[First Number + √(Second Number)]² = Third Number 

In 4 + 25 = 81:

(4 + √25)²

= (4 + 5)² = 9²

= 92 = 81

In 9 + 49 = 256:

(9 + √49)²

= (9 + 7)²

= 16² = 256

In 7 + 16

(7 + √16)2

= (7 + 4)2

= 112 = 121

Hence, "121" is the correct answer.