Brian runs 3 miles in 25 minutes 30 seconds, and Mary runs 4 miles in 34
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A good way of doing this problem would be to use cross multiplication of ratios
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Then cross multiply
(10 girls)(270 students)=(X girls)(18 students)
2700=18x
150=x
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Then cross multiply
(10 girls)(270 students)=(X girls)(18 students)
2700=18x
150=x