There are twice as many adults as children in a park, and there are thrice as many girls as boys. If there are 1860 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 |
3 u |
8 u |
4 u |
(a)
Number of boys = 1 u
Number of girls = 3 x 1 u = 3 u
Number of children = 3 u + 1 u = 4 u
Number of adults = 2 x 4 u = 8 u
People in the park
= 4 u + 8 u
= 12 u
12 u = 1860
1 u = 1860 ÷ 12 = 155
Number of adults
= 8 u
= 8 x 155
= 1240
(b)
Number of children
= 4 u
= 4 x 155
= 620
(c)
Number of girls
= 3 u
= 3 x 155
= 465
Answer(s): (a) 1240; (b) 620; (c) 465