Three minutes ago, 70% of the children in a hall were girls. 76 more children entered the hall. As a result, the number of girls increased by 20% and the number of boys increased by 60%. How many children are in the hall now?
| |
Girls |
Boys |
Total |
| Before |
10 u |
3 u |
13 u |
| Change |
+ 2 u |
+ 1.8 u |
+ 3.8 u |
| After |
12 u |
4.8 u |
16.8 u |
70% =
70100 =
710Number of more girls who entered the hall
= 20% x 10 u
=
20100 x 10 u
= 2 u
Number of more boys who entered the hall
= 60% x 3 u
=
60100 x 3 u
= 1.8 u
Total number of more children who entered the hall
= 2 u + 1.8 u
= 3.8 u
3.8 u = 76
1 u = 76 ÷ 3.8 = 20
Number of children in the hall now
= 12 u + 4.8 u
= 16.8 u
= 16.8 x 20
= 336
Answer(s): 336
