There were 3 more boys than girls in the classroom. Excluding 8 girls, the number of girls was
45 of the number of boys. When another 7 boys joined, what fraction of the students were boys in the end? Give your answer in its simplest form.
|
Boys |
Girls |
Comparing boys and girls at first |
3 more |
|
Before |
5 u |
4 u + 8 |
Change |
+ 7 |
|
After |
5 u + 7 |
4 u + 8 |
Number of boys at first was 3 more than the number of girls. If another 3 girls entered the classroom at first, the number of boys and girls at first would be the same.
5 u = 4 u + 8 + 3
5 u - 4 u = 8 + 3
1 u = 11
Total number of boys in the end
= 5 u + 7
= 5 x 11 + 7
= 55 + 7
= 62
Total number of students in the end
= 5 u + 7 + 4 u + 8
= 9 u + 15
= 9 x 11 + 15
= 114
Fraction of the students who were boys in the end
=
62114 =
3157 Answer(s):
3157