Asked by Aimanele

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.
Answered by Aimanele
No response
Answered by 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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