There are 990 people,
of which 90 are boys.
There are 450 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 = 90
Number of adults = 1 u
Number of girls = 1 u + 450
Total number of people
= 90 + 1 u + 1 u + 450
= 1 u + 1 u + 90 + 450
= 2 u + 540
2 u + 540 = 990
2 u = 990 - 540
2 u = 450
1 u = 450 ÷ 2 = 225
Number of adults
= 1 u
= 225
(b)
Number of children
= 90 + 1 u + 450
= 90 + 225 + 450
= 765
(c)
Number of less adults than children
= 765 - 225
= 540
(d)
Number of more girls than boys
= 1 u + 450 - 90
= 225 + 450 - 90
= 585
Answer(s): (a) 225; (b) 765; (c) 540; (d) 585