PSLE On Tuesday, the number of adults to boys to girls visiting a safari park was 1 : 10 : 4. On Wednesday, the number of adults visiting the safari park remained the same. However, the number of boys increased by 10% and the number of girls decreased by 25%.
- What was the ratio of the number of adults to boys to girls visiting the safari park on Wednesday?
- On Tuesday, 658 boys and girls visited the safari park. What was the total number of visitors at the safari park on Wednesday?
|
Adults |
Boys |
Girls |
Before |
1 u |
10 u |
4 u |
Change |
|
+ 1 u |
- 1 u |
After |
1 u |
11 u |
3 u |
(a)
Increase in the number of boys
= 10% x 10 u
=
10100 x 10 u
= 1 u
Decrease in the number of girls
= 25% x 4 u
=
25100 x 4 u
= 1 u
Number of boys on Wednesday
= 10 u + 1 u
= 11 u
Number of girls on Wednesday
= 4 u - 1 u
= 3 u
On Wednesday
Adults : Boys : Girls
1 : 11 : 3
(b)
Number of boys and girls on Tuesday
= 10 u + 4 u
= 14 u
14 u = 658
1 u = 658 ÷ 14 = 47
Total number of visitors on Wednesday
= 1 u + 11 u + 3 u
= 15 u
= 15 x 47
= 705
Answer(s): (a) 1 : 11 : 3; (b) 705