There are thrice as many adults as children in a bird park, and there are twice as many girls as boys. If there are 1032 people in the bird park,
- how many adults are there?
- how many children are there?
- how many girls are there?
| Adults |
Children |
| |
Boys |
Girls |
| |
1 u |
2 u |
| 9 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 = 3 x 3 u = 9 u
People in the bird park
= 3 u + 9 u
= 12 u
12 u = 1032
1 u = 1032 ÷ 12 = 86
Number of adults
= 9 u
= 9 x 86
= 774
(b)
Number of children
= 3 u
= 3 x 86
= 258
(c)
Number of girls
= 2 u
= 2 x 86
= 172
Answer(s): (a) 774; (b) 258; (c) 172
