Question

3. What is the missing number in the equation below? 20 + 45 = ? (4 + 9)

Answer 1

20 + 45 = ? (4+ 9)

Let x be the missing number

20 + 45 = x (4+9)

65 = x(13)

Divide both-side of the equation by 13

65/13 = x

5 = x

x=5

Hence the missing number is 5