There are 450 people,
of which 40 are boys.
There are 290 less adults than girls.
- How many adults are there?
- How many children are there?
- How many less adults than children are there?
- How many more girls than boys are there?
(a)
Number of boys = 40
Number of adults = 1 u
Number of girls = 1 u + 290
Total number of people
= 40 + 1 u + 1 u + 290
= 1 u + 1 u + 40 + 290
= 2 u + 330
2 u + 330 = 450
2 u = 450 - 330
2 u = 120
1 u = 120 ÷ 2 = 60
Number of adults
= 1 u
= 60
(b)
Number of children
= 40 + 1 u + 290
= 40 + 60 + 290
= 390
(c)
Number of less adults than children
= 390 - 60
= 330
(d)
Number of more girls than boys
= 1 u + 290 - 40
= 60 + 290 - 40
= 310
Answer(s): (a) 60; (b) 390; (c) 330; (d) 310