There are twice as many adults as children in a park, and there are twice as many girls as boys. If there are 1089 people in the park,
- how many adults are there?
- how many children are there?
- how many girls are there?
| Adults |
Children |
| |
Boys |
Girls |
| |
1 u |
2 u |
| 6 u |
3 u |
(a)
Number of boys = 1 u
Number of girls = 2 x 1 u = 2 u
Number of children = 2 u + 1 u = 3 u
Number of adults = 2 x 3 u = 6 u
People in the park
= 3 u + 6 u
= 9 u
9 u = 1089
1 u = 1089 ÷ 9 = 121
Number of adults
= 6 u
= 6 x 121
= 726
(b)
Number of children
= 3 u
= 3 x 121
= 363
(c)
Number of girls
= 2 u
= 2 x 121
= 242
Answer(s): (a) 726; (b) 363; (c) 242
