At summer camp the ratio or boys to girls was 10: 1.if there were 30 boys, how many girl were there?

There were 3 girls. If the ratio is 10;1, then you’d make it 30;_. To get 30 from ten, you do times 3, and so you do that to the one as well, and 1x3=3

There were 3 girls in summer camp

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