There are 420 girls and boys at a community centre. The ratio of girls and boys at the centre is 7to 3. How many girls are at the concert

Question

Mathematics

Seth Conway

27 October, 21:10

There are 420 girls and boys at a community centre. The ratio of girls and boys at the centre is 7to 3. How many girls are at the concert

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Answers (1)

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Joseph Clay · Answer 1

G + b = 420;

g / b = 7 / 3;

Then, g = (7 / 3) b;

(7 / 3) b + b = 420;

7b + 3b = 1260;

10b = 1260;

b = 126 (boys);

g = (7 / 3) * 126 = 294 (girls);