PSLE On Friday, the number of adults to girls to boys visiting a theme park was 1 : 10 : 10. On Saturday, the number of adults visiting the theme park remained the same. However, the number of girls decreased by 40% and the number of boys increased by 30%.
- What was the ratio of the number of children to adults visiting the theme park on Saturday?
- On Friday, 880 girls and boys visited the theme park. What was the total number of child visitors at the theme park on Saturday?
|
Adults |
Girls |
Boys |
Before |
1 u |
10 u |
10 u |
Change |
|
- 4 u |
+ 3 u |
After |
1 u |
6 u |
13 u |
(a)
Increase in the number of girls
= 40% x 10 u
=
40100 x 10 u
= 4 u
Decrease in the number of boys
= 30% x 10 u
=
30100 x 10 u
= 3 u
Number of girls on Saturday
= 10 u - 4 u
= 6 u
Number of boys on Saturday
= 10 u + 3 u
= 13 u
Number of children on Saturday
= 6 u + 13 u
= 19 u
On Saturday
Children : Adults
19 : 1
(b)
Number of girls and boys on Friday
= 10 u + 10 u
= 20 u
20 u = 880
1 u = 880 ÷ 20 = 44
Total number of child visitors on Saturday
= 19 u
= 19 x 44
= 836
Answer(s): (a) 19 : 1; (b) 836