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 Question from jane, a parent: The ratio of the number of boys to the number of girls in the concert hall is 5:3. After additional 28 boys entered the concert hall, the ratio of the number of boys to the number of girls become 3:1 How many girls are their in the concert hall?

Hi Jane,

I can help get you started.

Since the ratio of boys to girls is 5:3 you can put the attendees in groups of 8 with 5 being boys and 3 being girls. Thus the fraction of boys is 5/8.

Suppose the number of attendees is $x$ then the number of attendees who are boys is $\frac58 \times x.$

Write back if you need more assistance.

Penny

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