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The total number of students in the 8th grade is 120. What is the number of girls in the grade if the number of girls is 1/3 that of boys?

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Let g = girls
b = boys
1) b + g = 120
2) g = 1/3b
Substitute 1/3b for g in 1)
b + 1/3b = 120
4/3b = 120
/4/3. /4/3
b = 120 x 3/4
b = 90, g = 1/3b = 1/3(90) = 30
b = 90, g = 30. ANSWER

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