Question

The sum of a number and eight is twenty -one. What equals the number

Answer 1

Answer:

13

Step-by-step explanation:

Let the no. be x

x + 8 = 21

x = 21 - 8 = 13

Answer 2

Answer:

x = 13

Step-by-step explanation:

let the number be x

x + 8 = 21

x = 21 - 8

x = 13