There are 60 people,
of which 20 are girls.
There are 30 more adults than boys.
- How many adults are there?
- How many children are there?
- How many more adults than children are there?
- How many less boys than girls are there?
(a)
Number of girls = 20
Number of boys = 1 u
Number of adults = 1 u + 30
Total number of people
= 20 + 1 u + 1 u + 30
= 1 u + 1 u + 20 + 30
= 2 u + 50
2 u + 50 = 60
2 u = 60 - 50
2 u = 10
1 u = 10 ÷ 2 = 5
Number of adults
= 1 u + 30
= 5 + 30
= 35
(b)
Number of children
= 20 + 5
= 25
(c)
Number of more adults than children
= 35 - 25
= 10
(d)
Number of less boys than girls
= 20 - 5
= 15
Answer(s): (a) 35; (b) 25; (c) 10; (d) 15