There are 80 people,
of which 20 are boys.
There are 50 more adults than girls.
- How many adults are there?
- How many children are there?
- How many more adults than children are there?
- How many less girls than boys are there?
(a)
Number of boys = 20
Number of girls = 1 u
Number of adults = 1 u + 50
Total number of people
= 20 + 1 u + 1 u + 50
= 1 u + 1 u + 20 + 50
= 2 u + 70
2 u + 70 = 80
2 u = 80 - 70
2 u = 10
1 u = 10 ÷ 2 = 5
Number of adults
= 1 u + 50
= 5 + 50
= 55
(b)
Number of children
= 20 + 5
= 25
(c)
Number of more adults than children
= 55 - 25
= 30
(d)
Number of less girls than boys
= 20 - 5
= 15
Answer(s): (a) 55; (b) 25; (c) 30; (d) 15