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Question:

A classroom has 15 boys and 13 girls. If 10 more girls join the class, what is the ratio of girls to boys?

A
23 : 15

Explaination

First, calculate how many girls there will be after 10 more join the class: 13 + 10 = 23

Then, express the number of girls compared to boys as a ratio: 23 : 15.