There are 720 people,
of which 200 are men.
There are 220 less adults than women.
- How many children are there?
- How many adults are there?
- How many less children than adults are there?
- How many more women than men are there?
(a)
Number of men = 200
Number of children = 1 u
Number of women = 1 u + 220
Total number of people
= 200 + 1 u + 1 u + 220
= 1 u + 1 u + 200 + 220
= 2 u + 420
2 u + 420 = 720
2 u = 720 - 420
2 u = 300
1 u = 300 ÷ 2 = 150
Number of children
= 1 u
= 150
(b)
Number of adults
= 200 + 1 u + 220
= 200 + 150 + 220
= 570
(c)
Number of less children than adults
= 570 - 150
= 420
(d)
Number of more women than men
= 1 u + 220 - 200
= 150 + 220 - 200
= 170
Answer(s): (a) 150; (b) 570; (c) 420; (d) 170