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} 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
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