Question

If the difference of twice of a number and 8 is tripled the result is 18 what is the unknown number

Answer 1

7

Explanation:

let the number be n then twice the number is 2n and difference between it and 8 is 2n - 8. Tripling this and equating to 18 is then

3(2n - 8) = 18 ( divide both sides by 3 )

2n - 8 = 6 ( add 8 to both sides )

2n = 14 ( divide both sides by 2 )

n = 7

the unknown number is 7