7th Class Mental Ability Letters Question Bank Using letters for numbers

Directions: With this type of questions you are given a number equation (number sentence) with a number missing. Both sides of the equation need to have the same value. You are required to find the missing number that will balance the equation.

\[\text{9 }\!\!\times\!\!\text{ 9 + 9 = 10 }\!\!\times\!\!\text{ 10 - }\!\![\!\!\text{ ? }\!\!]\!\!\text{ }\]

A) 8

B)        12

C) 10

D)        9

Correct Answer: C

Solution :

\[9\times 9+9=10\times 10-\] Both sides total 90