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The ratio of boys to girls on a school trip was 5.7. There were 56girls. How many boys were on the trip

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I will assume you meant 5 : 7
number of boys --- 5x
number of girls ---- 7x

given: 7x = 56
x = 8
number of boys = 5x = ....

5/7 = B/G.
5/7 = B/56,
7B = 280,
B = ?

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