There are 610 people,
of which 90 are girls.
There are 360 less adults than boys.
- How many adults are there?
- How many children are there?
- How many less adults than children are there?
- How many more boys than girls are there?
(a)
Number of girls = 90
Number of adults = 1 u
Number of boys = 1 u + 360
Total number of people
= 90 + 1 u + 1 u + 360
= 1 u + 1 u + 90 + 360
= 2 u + 450
2 u + 450 = 610
2 u = 610 - 450
2 u = 160
1 u = 160 ÷ 2 = 80
Number of adults
= 1 u
= 80
(b)
Number of children
= 90 + 1 u + 360
= 90 + 80 + 360
= 530
(c)
Number of less adults than children
= 530 - 80
= 450
(d)
Number of more boys than girls
= 1 u + 360 - 90
= 80 + 360 - 90
= 350
Answer(s): (a) 80; (b) 530; (c) 450; (d) 350