PSLE On Tuesday, the number of adults to boys to girls visiting a park was 1 : 10 : 5. On Wednesday, the number of adults visiting the park remained the same. However, the number of boys increased by 50% and the number of girls decreased by 40%.
- What was the ratio of the number of adults to boys to girls visiting the park on Wednesday?
- On Tuesday, 360 boys and girls visited the park. What was the total number of visitors at the park on Wednesday?
|
Adults |
Boys |
Girls |
Before |
1 u |
10 u |
5 u |
Change |
|
+ 5 u |
- 2 u |
After |
1 u |
15 u |
3 u |
(a)
Increase in the number of boys
= 50% x 10 u
=
50100 x 10 u
= 5 u
Decrease in the number of girls
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of boys on Wednesday
= 10 u + 5 u
= 15 u
Number of girls on Wednesday
= 5 u - 2 u
= 3 u
On Wednesday
Adults : Boys : Girls
1 : 15 : 3
(b)
Number of boys and girls on Tuesday
= 10 u + 5 u
= 15 u
15 u = 360
1 u = 360 ÷ 15 = 24
Total number of visitors on Wednesday
= 1 u + 15 u + 3 u
= 19 u
= 19 x 24
= 456
Answer(s): (a) 1 : 15 : 3; (b) 456