There are 90 people,
of which 20 are men.
There are 30 less children 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 + 30
Total number of people
= 20 + 1 u + 1 u + 30
= 1 u + 1 u + 20 + 30
= 2 u + 50
2 u + 50 = 90
2 u = 90 - 50
2 u = 40
1 u = 40 ÷ 2 = 20
Number of children
= 1 u
= 20
(b)
Number of adults
= 20 + 1 u + 30
= 20 + 20 + 30
= 70
(c)
Number of less children than adults
= 70 - 20
= 50
(d)
Number of more women than men
= 1 u + 30 - 20
= 20 + 30 - 20
= 30
Answer(s): (a) 20; (b) 70; (c) 50; (d) 30