There are 420 people,
of which 40 are women.
There are 280 less adults than men.
- How many children are there?
- How many adults are there?
- How many less children than adults are there?
- How many more men than women are there?
(a)
Number of women = 40
Number of children = 1 u
Number of men = 1 u + 280
Total number of people
= 40 + 1 u + 1 u + 280
= 1 u + 1 u + 40 + 280
= 2 u + 320
2 u + 320 = 420
2 u = 420 - 320
2 u = 100
1 u = 100 ÷ 2 = 50
Number of children
= 1 u
= 50
(b)
Number of adults
= 40 + 1 u + 280
= 40 + 50 + 280
= 370
(c)
Number of less children than adults
= 370 - 50
= 320
(d)
Number of more men than women
= 1 u + 280 - 40
= 50 + 280 - 40
= 290
Answer(s): (a) 50; (b) 370; (c) 320; (d) 290