There are 80 people,
of which 10 are girls.
There are 60 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 = 10
Number of adults = 1 u
Number of boys = 1 u + 60
Total number of people
= 10 + 1 u + 1 u + 60
= 1 u + 1 u + 10 + 60
= 2 u + 70
2 u + 70 = 80
2 u = 80 - 70
2 u = 10
1 u = 10 ÷ 2 = 5
Number of adults
= 1 u
= 5
(b)
Number of children
= 10 + 1 u + 60
= 10 + 5 + 60
= 75
(c)
Number of less adults than children
= 75 - 5
= 70
(d)
Number of more boys than girls
= 1 u + 60 - 10
= 5 + 60 - 10
= 55
Answer(s): (a) 5; (b) 75; (c) 70; (d) 55