There are 380 people,
of which 30 are women.
There are 310 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 = 30
Number of children = 1 u
Number of men = 1 u + 310
Total number of people
= 30 + 1 u + 1 u + 310
= 1 u + 1 u + 30 + 310
= 2 u + 340
2 u + 340 = 380
2 u = 380 - 340
2 u = 40
1 u = 40 ÷ 2 = 20
Number of children
= 1 u
= 20
(b)
Number of adults
= 30 + 1 u + 310
= 30 + 20 + 310
= 360
(c)
Number of less children than adults
= 360 - 20
= 340
(d)
Number of more men than women
= 1 u + 310 - 30
= 20 + 310 - 30
= 300
Answer(s): (a) 20; (b) 360; (c) 340; (d) 300