There are 720 people,
of which 130 are boys.
There are 580 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 = 130
Number of adults = 1 u
Number of girls = 1 u + 580
Total number of people
= 130 + 1 u + 1 u + 580
= 1 u + 1 u + 130 + 580
= 2 u + 710
2 u + 710 = 720
2 u = 720 - 710
2 u = 10
1 u = 10 ÷ 2 = 5
Number of adults
= 1 u
= 5
(b)
Number of children
= 130 + 1 u + 580
= 130 + 5 + 580
= 715
(c)
Number of less adults than children
= 715 - 5
= 710
(d)
Number of more girls than boys
= 1 u + 580 - 130
= 5 + 580 - 130
= 455
Answer(s): (a) 5; (b) 715; (c) 710; (d) 455