There are 710 people,
of which 90 are boys.
There are 540 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 + 540
Total number of people
= 90 + 1 u + 1 u + 540
= 1 u + 1 u + 90 + 540
= 2 u + 630
2 u + 630 = 710
2 u = 710 - 630
2 u = 80
1 u = 80 ÷ 2 = 40
Number of adults
= 1 u
= 40
(b)
Number of children
= 90 + 1 u + 540
= 90 + 40 + 540
= 670
(c)
Number of less adults than children
= 670 - 40
= 630
(d)
Number of more girls than boys
= 1 u + 540 - 90
= 40 + 540 - 90
= 490
Answer(s): (a) 40; (b) 670; (c) 630; (d) 490