how many girls is in a group of 146 people?
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B=boys, G=girls, A=adults

B/G=4/5, G/A=7/2

So B=4G/5 and A=2G/7.

Ratio: B:G:A=4G/5:G:2G/7 that is: 4/5:1:2/7.

Multiply each ratio by the LCM of 5 and 7:

28:35:10.

Ratio of kids to adults: (28+35)/10=63:10.

146 people: 28/73×146=56 boys,

35/73×146=70 girls, (70 girls in a class of 146 people)

10/73×146=20 adults.

Kids=126.

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