140 children were watching a magic show. The number of boys was 20 more than twice the number of girls watching the show. How many girls were there?

**x = number of girls**

2x + 20 = number of boys{number of boys was 20 more than twice the number of girls}

2x + 20 = number of boys

x + 2x + 20 = 140 {total number of boys and girls was 140}

3x + 20 = 140 {combined like terms}

3x = 120 {subtracted 20 from each side}

x = 40 {divided each side by 3}

there were

**40**girls

**- Algebra House**