A certain number, when added to 50% of itself, is 27. What is the number?

**x = the number**

x + 0.5x = 27 {a number, added to 1/2 of itself, equals 27}

1.5x = 27 {combined like terms}

x = 18 {divided each side by 1.5}

**the number is 18**

**- Algebra House**