Five minutes ago, 70% of the pupils in a hall were girls. 58 more pupils entered the hall. As a result, the number of girls increased by 40% and the number of boys increased by 60%. How many pupils are in the hall now?
| |
Girls |
Boys |
Total |
| Before |
10 u |
3 u |
13 u |
| Change |
+ 4 u |
+ 1.8 u |
+ 5.8 u |
| After |
14 u |
4.8 u |
18.8 u |
70% =
70100 =
710Number of more girls who entered the hall
= 40% x 10 u
=
40100 x 10 u
= 4 u
Number of more boys who entered the hall
= 60% x 3 u
=
60100 x 3 u
= 1.8 u
Total number of more pupils who entered the hall
= 4 u + 1.8 u
= 5.8 u
5.8 u = 58
1 u = 58 ÷ 5.8 = 10
Number of pupils in the hall now
= 14 u + 4.8 u
= 18.8 u
= 18.8 x 10
= 188
Answer(s): 188
