There are 870 people,
of which 130 are girls.
There are 350 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 = 130
Number of adults = 1 u
Number of boys = 1 u + 350
Total number of people
= 130 + 1 u + 1 u + 350
= 1 u + 1 u + 130 + 350
= 2 u + 480
2 u + 480 = 870
2 u = 870 - 480
2 u = 390
1 u = 390 ÷ 2 = 195
Number of adults
= 1 u
= 195
(b)
Number of children
= 130 + 1 u + 350
= 130 + 195 + 350
= 675
(c)
Number of less adults than children
= 675 - 195
= 480
(d)
Number of more boys than girls
= 1 u + 350 - 130
= 195 + 350 - 130
= 415
Answer(s): (a) 195; (b) 675; (c) 480; (d) 415