There are 930 people,
of which 80 are boys.
There are 780 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 = 80
Number of adults = 1 u
Number of girls = 1 u + 780
Total number of people
= 80 + 1 u + 1 u + 780
= 1 u + 1 u + 80 + 780
= 2 u + 860
2 u + 860 = 930
2 u = 930 - 860
2 u = 70
1 u = 70 ÷ 2 = 35
Number of adults
= 1 u
= 35
(b)
Number of children
= 80 + 1 u + 780
= 80 + 35 + 780
= 895
(c)
Number of less adults than children
= 895 - 35
= 860
(d)
Number of more girls than boys
= 1 u + 780 - 80
= 35 + 780 - 80
= 735
Answer(s): (a) 35; (b) 895; (c) 860; (d) 735