Question

1 is subtracted from 8 times a certain number.the result is 15.find the number

Answer 1

number is 2

Explanation:

let the number be n then 8 times the number is 8n, subtract 1 from this and

8n - 1 = 15 ( add 1 to both sides )

8n = 16 ( divide both sides by 8 )

n = 2

that is the number is 2