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Mathematics, 06.06.2020 17:57 allimaycatp8qgaq

29. The ratio of the number of girls to the number of boys in a hall was 2:3. After 10 girls and 10 boys entered the hall, the ratio of the number of girls
to the number of boys became 5:7. How many boys were there in the hall
at first?
22

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29. The ratio of the number of girls to the number of boys in a hall was 2:3. After 10 girls and 10...

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