There are 400 people,
of which 20 are men.
There are 210 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 = 20
Number of children = 1 u
Number of women = 1 u + 210
Total number of people
= 20 + 1 u + 1 u + 210
= 1 u + 1 u + 20 + 210
= 2 u + 230
2 u + 230 = 400
2 u = 400 - 230
2 u = 170
1 u = 170 ÷ 2 = 85
Number of children
= 1 u
= 85
(b)
Number of adults
= 20 + 1 u + 210
= 20 + 85 + 210
= 315
(c)
Number of less children than adults
= 315 - 85
= 230
(d)
Number of more women than men
= 1 u + 210 - 20
= 85 + 210 - 20
= 275
Answer(s): (a) 85; (b) 315; (c) 230; (d) 275