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
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