Asked by maths

. 30 girls and boys have planned for a picnic. There is a ratio of
3 girls to 7 boys. How many boys are there?
Answered by pat
70
Answered by Henry
X boys.
3x/7 girls.

x + 3x/7 = 30.
7x + 3x = 210.
10x = 210.
X = 21.
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