iQ Test Question (Solution 5)

IQ Test Question 5

 Correct Answer is 9.

(8 × 2) - (3 × 5)
16 - 15
= 1

(10 × 5) - (7 × 7)
50 - 49
= 1

(5 × 2) - ( ? × 1) = 1
10 - (?) = 1
(?) = 10 - 1
(?) = 9 ✓