There are 100 people,
of which 40 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 = 40
Number of boys = 1 u
Number of adults = 1 u + 50
Total number of people
= 40 + 1 u + 1 u + 50
= 1 u + 1 u + 40 + 50
= 2 u + 90
2 u + 90 = 100
2 u = 100 - 90
2 u = 10
1 u = 10 ÷ 2 = 5
Number of adults
= 1 u + 50
= 5 + 50
= 55
(b)
Number of children
= 40 + 5
= 45
(c)
Number of more adults than children
= 55 - 45
= 10
(d)
Number of less boys than girls
= 40 - 5
= 35
Answer(s): (a) 55; (b) 45; (c) 10; (d) 35