There are twice as many adults as children in a bird park, and there are twice as many boys as girls. If there are 1566 people in the bird park,
- how many adults are there?
- how many children are there?
- how many boys are there?
| Adults |
Children |
| |
Girls |
Boys |
| |
1 u |
2 u |
| 6 u |
3 u |
(a)
Number of girls = 1 u
Number of boys = 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 bird park
= 3 u + 6 u
= 9 u
9 u = 1566
1 u = 1566 ÷ 9 = 174
Number of adults
= 6 u
= 6 x 174
= 1044
(b)
Number of children
= 3 u
= 3 x 174
= 522
(c)
Number of boys
= 2 u
= 2 x 174
= 348
Answer(s): (a) 1044; (b) 522; (c) 348
