The difference between 5 times a number and 20 equals the sum of the number and 40. Find the number

Answer 1

x = Your number

The difference between 5 times a number and 20 equals the sum of the number and 40 mean:

5 x - 20 = x + 40

5 x - 20 = x + 40 Subtract x to both sides

5x - 20 - x = x + 40 - x

4 x - 20 = 40 Add 20 to both sides

4 x - 20 + 20 = 40 + 20

4 x = 60 Divide both sides by 4

x = 60 / 4

x = 15

Proof:

5 x - 20 = x + 40

5 * 15 - 20 = 15 + 40

75 - 20 = 15 + 40

55 = 55