Ros5y04 Ros5y04

01-04-2016
Mathematics

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30 girls and boys have planned for a picnic There is a ratio of 3 girls to 7 boys How many boys are there

30 girls and boys have planned for a picnic There is a ratio of 3 girls to 7 boys How many boys are there class=

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Coventry0127 Coventry0127

01-04-2016

If the ratio is 3:7, that means in every group of 10, there are 3 girls and 7 boys. If there are 30 people total, then there are 3 groups of 10. Therefore 7*3=21. So there are 21 boys.

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