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Ratio-and-Proportion-->View question

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vivek25

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a) Number of girls: number of boys = 20: 15
=20/15 =4/3
= 4:3
b) Number of girls = 20
Number of boys = 15
Total number of students in the class = 35
Number of girls: total number of students in the class = 20: 35
=20/35
=4:7

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