There are 260 people,
of which 70 are boys.
There are 100 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 = 70
Number of adults = 1 u
Number of girls = 1 u + 100
Total number of people
= 70 + 1 u + 1 u + 100
= 1 u + 1 u + 70 + 100
= 2 u + 170
2 u + 170 = 260
2 u = 260 - 170
2 u = 90
1 u = 90 ÷ 2 = 45
Number of adults
= 1 u
= 45
(b)
Number of children
= 70 + 1 u + 100
= 70 + 45 + 100
= 215
(c)
Number of less adults than children
= 215 - 45
= 170
(d)
Number of more girls than boys
= 1 u + 100 - 70
= 45 + 100 - 70
= 75
Answer(s): (a) 45; (b) 215; (c) 170; (d) 75