Boys and girls

There are 28 girls in the hall. 5/7 of all children are boys. How many children and how many boys are there?

Correct answer:

c =  70
s =  98

Step-by-step explanation:

c+28 = s
5/7 s = c

c+28 = s
5/7•s = c

c-s = -28
7c-5s = 0

c = 70
s = 98

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