There are 100 people,
of which 30 are boys.
There are 40 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 = 30
Number of girls = 1 u
Number of adults = 1 u + 40
Total number of people
= 30 + 1 u + 1 u + 40
= 1 u + 1 u + 30 + 40
= 2 u + 70
2 u + 70 = 100
2 u = 100 - 70
2 u = 30
1 u = 30 ÷ 2 = 15
Number of adults
= 1 u + 40
= 15 + 40
= 55
(b)
Number of children
= 30 + 15
= 45
(c)
Number of more adults than children
= 55 - 45
= 10
(d)
Number of less girls than boys
= 30 - 15
= 15
Answer(s): (a) 55; (b) 45; (c) 10; (d) 15