Nineteen minutes ago, 70% of the pupils in a hall were girls. 54 more pupils entered the hall. As a result, the number of girls increased by 30% and the number of boys increased by 80%. How many pupils are in the hall now?
| |
Girls |
Boys |
Total |
| Before |
10 u |
3 u |
13 u |
| Change |
+ 3 u |
+ 2.4 u |
+ 5.4 u |
| After |
13 u |
5.4 u |
18.4 u |
70% =
70100 =
710Number of more girls who entered the hall
= 30% x 10 u
=
30100 x 10 u
= 3 u
Number of more boys who entered the hall
= 80% x 3 u
=
80100 x 3 u
= 2.4 u
Total number of more pupils who entered the hall
= 3 u + 2.4 u
= 5.4 u
5.4 u = 54
1 u = 54 ÷ 5.4 = 10
Number of pupils in the hall now
= 13 u + 5.4 u
= 18.4 u
= 18.4 x 10
= 184
Answer(s): 184
