There are 720 people,
of which 150 are girls.
There are 420 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 + 420
Total number of people
= 150 + 1 u + 1 u + 420
= 1 u + 1 u + 150 + 420
= 2 u + 570
2 u + 570 = 720
2 u = 720 - 570
2 u = 150
1 u = 150 ÷ 2 = 75
Number of adults
= 1 u
= 75
(b)
Number of children
= 150 + 1 u + 420
= 150 + 75 + 420
= 645
(c)
Number of less adults than children
= 645 - 75
= 570
(d)
Number of more boys than girls
= 1 u + 420 - 150
= 75 + 420 - 150
= 345
Answer(s): (a) 75; (b) 645; (c) 570; (d) 345