Question

Three times a number decreased by 9 gives 39 find the number

Answer 1

number is 16

Explanation:

let n be the number then three times the number is 3n and decreased by 9 is

3n - 9

form the equation

3n - 9 = 39 ( add 9 to both sides )

3n - 9 + 9 = 39 + 9 ( simplify both sides )

3n = 48 ( divide both sides by 3 )

`(3)/(3)` n =
`(48)/(3)` , that is

n = 16

the number is 16