There are 90 people,
of which 10 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 = 10
Number of children = 1 u
Number of women = 1 u + 30
Total number of people
= 10 + 1 u + 1 u + 30
= 1 u + 1 u + 10 + 30
= 2 u + 40
2 u + 40 = 90
2 u = 90 - 40
2 u = 50
1 u = 50 ÷ 2 = 25
Number of children
= 1 u
= 25
(b)
Number of adults
= 10 + 1 u + 30
= 10 + 25 + 30
= 65
(c)
Number of less children than adults
= 65 - 25
= 40
(d)
Number of more women than men
= 1 u + 30 - 10
= 25 + 30 - 10
= 45
Answer(s): (a) 25; (b) 65; (c) 40; (d) 45