There are 390 people,
of which 150 are girls.
There are 150 less adults than boys.
- How many adults are there?
- How many children are there?
- How many less adults than children are there?
- How many more boys than girls are there?
(a)
Number of girls = 150
Number of adults = 1 u
Number of boys = 1 u + 150
Total number of people
= 150 + 1 u + 1 u + 150
= 1 u + 1 u + 150 + 150
= 2 u + 300
2 u + 300 = 390
2 u = 390 - 300
2 u = 90
1 u = 90 ÷ 2 = 45
Number of adults
= 1 u
= 45
(b)
Number of children
= 150 + 1 u + 150
= 150 + 45 + 150
= 345
(c)
Number of less adults than children
= 345 - 45
= 300
(d)
Number of more boys than girls
= 1 u + 150 - 150
= 45 + 150 - 150
= 45
Answer(s): (a) 45; (b) 345; (c) 300; (d) 45