Three minutes ago, 80% of the children in a hall were boys. 16 more children entered the hall. As a result, the number of boys increased by 20% and the number of girls increased by 60%. How many children are in the hall now?
| |
Boys |
Girls |
Total |
| Before |
5 u |
1 u |
6 u |
| Change |
+ 1 u |
+ 0.6 u |
+ 1.6 u |
| After |
6 u |
1.6 u |
7.6 u |
80% =
80100 =
45Number of more boys who entered the hall
= 20% x 5 u
=
20100 x 5 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 children who entered the hall
= 1 u + 0.6 u
= 1.6 u
1.6 u = 16
1 u = 16 ÷ 1.6 = 10
Number of children in the hall now
= 6 u + 1.6 u
= 7.6 u
= 7.6 x 10
= 76
Answer(s): 76
