Question

3/7 of a class are boys. What fraction of the class consists of girls if there are 28 girls, how many boys are there in the class.

Answers

Aimanele
No response
Bosnian
Fraction of girls:

1 - 3 / 7 = 7 / 7 - 3 / 7 = 4 / 7

x = numbers of sudents

there are 28 girls

4 / 7 x = 28

Multiply both sides by 7

4 x = 196

x = 196 / 4 = 49

49 students there in the class.

3 / 7 of 49 are boys

3 • 49 / 7 = 21 boys

OR

boys / girls = 3 / 4

3 • 28 / 4 = 21 boys

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