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1. In a management class, the ratio of boys to girls is 6:7; if there are 18 boys in the class. Find
the number of girls?
If the ratio is 6:7, and the number of boys is 18, we divide 18 by 6 to get 3. Which means 3 times 6 is 18. If we multiply the numerator by 3, we do the same to the denominator. 7・3 is 21. Therefore there are 21 girls. (The ratio is 18:21)
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