There are 100 people,
of which 20 are girls.
There are 50 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 + 50
Total number of people
= 20 + 1 u + 1 u + 50
= 1 u + 1 u + 20 + 50
= 2 u + 70
2 u + 70 = 100
2 u = 100 - 70
2 u = 30
1 u = 30 ÷ 2 = 15
Number of adults
= 1 u + 50
= 15 + 50
= 65
(b)
Number of children
= 20 + 15
= 35
(c)
Number of more adults than children
= 65 - 35
= 30
(d)
Number of less boys than girls
= 20 - 15
= 5
Answer(s): (a) 65; (b) 35; (c) 30; (d) 5