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number of boys = ratio of boys x total strength / total ratio

= 5 x 27/9

= 5 x 3

= 15

number of girls = ratio of girls x total strength / total ratio

= 4 x 27/9

= 4 x 3

= 12

verification:

15 + 12 = 27

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Q: What is the boy-girl ratio in the class was 5 to 4 If there were 27 students how many boys were there?
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