There are 860 people,
of which 200 are men.
There are 520 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 + 520
Total number of people
= 200 + 1 u + 1 u + 520
= 1 u + 1 u + 200 + 520
= 2 u + 720
2 u + 720 = 860
2 u = 860 - 720
2 u = 140
1 u = 140 ÷ 2 = 70
Number of children
= 1 u
= 70
(b)
Number of adults
= 200 + 1 u + 520
= 200 + 70 + 520
= 790
(c)
Number of less children than adults
= 790 - 70
= 720
(d)
Number of more women than men
= 1 u + 520 - 200
= 70 + 520 - 200
= 390
Answer(s): (a) 70; (b) 790; (c) 720; (d) 390