Ten minutes ago, 75% of the students in a hall were boys. 24 more students entered the hall. As a result, the number of boys increased by 25% and the number of girls increased by 60%. How many students are in the hall now?
| |
Boys |
Girls |
Total |
| Before |
4 u |
1 u |
5 u |
| Change |
+ 1 u |
+ 0.6 u |
+ 1.6 u |
| After |
5 u |
1.6 u |
6.6 u |
75% =
75100 =
34Number of more boys who entered the hall
= 25% x 4 u
=
25100 x 4 u
= 1 u
Number of more girls who entered the hall
= 60% x 1 u
=
60100 x 1 u
= 0.6 u
Total number of more students who entered the hall
= 1 u + 0.6 u
= 1.6 u
1.6 u = 24
1 u = 24 ÷ 1.6 = 15
Number of students in the hall now
= 5 u + 1.6 u
= 6.6 u
= 6.6 x 15
= 99
Answer(s): 99
