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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?

Sagot :

should be 21 boys because 7+7+7 equal 21 and 3+3+3 equal 9 which equals 30
I got 21. For every 3 there was 7, so put down 3, add 7 and do such untiollyour total value is 30.