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.

\[40\text{ }\div \text{ }10\text{ }-\text{ }1\text{ }=\text{ }[?]\text{ }\text{ }13\text{ }-\text{ }4\]

A) 10

B)        12

C) 17

D)        20

Correct Answer: D

Solution :

\[40\div 10-1=-13-4\] Both sides total 3