There are 910 people,
of which 120 are girls.
There are 630 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 = 120
Number of adults = 1 u
Number of boys = 1 u + 630
Total number of people
= 120 + 1 u + 1 u + 630
= 1 u + 1 u + 120 + 630
= 2 u + 750
2 u + 750 = 910
2 u = 910 - 750
2 u = 160
1 u = 160 ÷ 2 = 80
Number of adults
= 1 u
= 80
(b)
Number of children
= 120 + 1 u + 630
= 120 + 80 + 630
= 830
(c)
Number of less adults than children
= 830 - 80
= 750
(d)
Number of more boys than girls
= 1 u + 630 - 120
= 80 + 630 - 120
= 590
Answer(s): (a) 80; (b) 830; (c) 750; (d) 590