Eight minutes ago, 80% of the pupils in a basketball court were boys. 17 more pupils entered the basketball court. As a result, the number of boys increased by 20% and the number of girls increased by 70%. How many pupils are in the basketball court now?
| |
Boys |
Girls |
Total |
| Before |
5 u |
1 u |
6 u |
| Change |
+ 1 u |
+ 0.7 u |
+ 1.7 u |
| After |
6 u |
1.7 u |
7.7 u |
80% =
80100 =
45Number of more boys who entered the basketball court
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of more girls who entered the basketball court
= 70% x 1 u
=
70100 x 1 u
= 0.7 u
Total number of more pupils who entered the basketball court
= 1 u + 0.7 u
= 1.7 u
1.7 u = 17
1 u = 17 ÷ 1.7 = 10
Number of pupils in the basketball court now
= 6 u + 1.7 u
= 7.7 u
= 7.7 x 10
= 77
Answer(s): 77
