Eighteen minutes ago, 75% of the children in a hall were girls. 8 more children entered the hall. As a result, the number of girls increased by 25% and the number of boys increased by 60%. How many children are in the hall now?
| |
Girls |
Boys |
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 girls who entered the hall
= 25% x 4 u
=
25100 x 4 u
= 1 u
Number of more boys who entered the hall
= 60% x 1 u
=
60100 x 1 u
= 0.6 u
Total number of more children who entered the hall
= 1 u + 0.6 u
= 1.6 u
1.6 u = 8
1 u = 8 ÷ 1.6 = 5
Number of children in the hall now
= 5 u + 1.6 u
= 6.6 u
= 6.6 x 5
= 33
Answer(s): 33
