Step-by-step explanation:
boys : girls : adults
3 : 4 :
5 : 7
15 : 20 : 28
children : adults
15 + 20 : 28
35 : 28
5 : 4
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The ratio of children to adults at the camp is 5 : 4
Given that, the ratio of boys to girls is 3 : 4
and the ratio of girls to adults is 5 : 7
First we have to find ratio of boys to girl to adult ,
boys : girl : adults = 15 : 20 : 28
Since, boys and girls comes under the children.
So that, ratio of children to adult is,
Children : adult = (15 + 20) : 28
Children : adult = 35 : 28
Children : adult = 5 : 4
The ratio of children to adults at the camp is 5 : 4
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