Question

Twenty less than 8 times a number is the same as 15 more than the number written in number form

Answer 1

Let the number be x.

We have an equation: 8x -20= 15+ x
⇒ 8x -x= 15+20
⇒ 7x= 35
⇒ x= 35/7
⇒ x= 5

The number is 5~

Answer 2

8x - 20 = x + 15

let x be the number.

twenty less than 8 times a number is 8x - 20

15 more than the number is x + 15

8x - 20 = x + 15
8x - x = 15 + 20
7x = 35
7x / 7 = 35 / 7
x = 5

To check:

8x - 20 = x + 15
8(5) - 20 = 5 + 15
40 - 20 = 20
20 = 20