There were 42 students in the classroom. There were 10% more girls than boys. A few girls went to the restroom. As a result, the number of boys became 25% more than the number of girls in the classroom. How many girls went to the restroom?
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There were 42 students in the classroom. There were 10% more girls than boys. A few girls went to the restroom. As a result, the number of boys became 25% more than the number of girls in the classroom. How many girls went to the restroom?
G = B + 0.10B —> G = 1.1B
B + G = 42 —> B + 1.1B = 42
2.1B = 42
B = 20 & G = 22
after x girls go to restroom . . .
B = (1.25)(G – x)
20 = (1.25)(22 – x) —> 22 – x = 20 / 1.25
22 – x = 16
– x = – 6
x = 6 —> 6 girls went to the restroom
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