There are 630 people,
of which 10 are boys.
There are 200 less adults than girls.
- How many adults are there?
- How many children are there?
- How many less adults than children are there?
- How many more girls than boys are there?
(a)
Number of boys = 10
Number of adults = 1 u
Number of girls = 1 u + 200
Total number of people
= 10 + 1 u + 1 u + 200
= 1 u + 1 u + 10 + 200
= 2 u + 210
2 u + 210 = 630
2 u = 630 - 210
2 u = 420
1 u = 420 ÷ 2 = 210
Number of adults
= 1 u
= 210
(b)
Number of children
= 10 + 1 u + 200
= 10 + 210 + 200
= 420
(c)
Number of less adults than children
= 420 - 210
= 210
(d)
Number of more girls than boys
= 1 u + 200 - 10
= 210 + 200 - 10
= 400
Answer(s): (a) 210; (b) 420; (c) 210; (d) 400