There are 810 people,
of which 220 are men.
There are 490 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 = 220
Number of children = 1 u
Number of women = 1 u + 490
Total number of people
= 220 + 1 u + 1 u + 490
= 1 u + 1 u + 220 + 490
= 2 u + 710
2 u + 710 = 810
2 u = 810 - 710
2 u = 100
1 u = 100 ÷ 2 = 50
Number of children
= 1 u
= 50
(b)
Number of adults
= 220 + 1 u + 490
= 220 + 50 + 490
= 760
(c)
Number of less children than adults
= 760 - 50
= 710
(d)
Number of more women than men
= 1 u + 490 - 220
= 50 + 490 - 220
= 320
Answer(s): (a) 50; (b) 760; (c) 710; (d) 320