There are 90 people,
of which 30 are men.
There are 50 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 = 30
Number of children = 1 u
Number of women = 1 u + 50
Total number of people
= 30 + 1 u + 1 u + 50
= 1 u + 1 u + 30 + 50
= 2 u + 80
2 u + 80 = 90
2 u = 90 - 80
2 u = 10
1 u = 10 ÷ 2 = 5
Number of children
= 1 u
= 5
(b)
Number of adults
= 30 + 1 u + 50
= 30 + 5 + 50
= 85
(c)
Number of less children than adults
= 85 - 5
= 80
(d)
Number of more women than men
= 1 u + 50 - 30
= 5 + 50 - 30
= 25
Answer(s): (a) 5; (b) 85; (c) 80; (d) 25