PSLE On Monday, the number of adults to boys to girls visiting a safari park was 3 : 6 : 10. On Tuesday, the number of adults visiting the safari park remained the same. However, the number of boys decreased by 50% and the number of girls increased by 50%.
- What was the ratio of the number of children to adults visiting the safari park on Tuesday?
- On Monday, 768 boys and girls visited the safari park. What was the total number of child visitors at the safari park on Tuesday?
|
Adults |
Boys |
Girls |
Before |
3 u |
6 u |
10 u |
Change |
|
- 3 u |
+ 5 u |
After |
3 u |
3 u |
15 u |
(a)
Increase in the number of boys
= 50% x 6 u
=
50100 x 6 u
= 3 u
Decrease in the number of girls
= 50% x 10 u
=
50100 x 10 u
= 5 u
Number of boys on Tuesday
= 6 u - 3 u
= 3 u
Number of girls on Tuesday
= 10 u + 5 u
= 15 u
Number of children on Tuesday
= 3 u + 15 u
= 18 u
On Tuesday
Children : Adults
18 : 3
(b)
Number of boys and girls on Monday
= 6 u + 10 u
= 16 u
16 u = 768
1 u = 768 ÷ 16 = 48
Total number of child visitors on Tuesday
= 18 u
= 18 x 48
= 864
Answer(s): (a) 18 : 3; (b) 864