There are 950 people,
of which 220 are girls.
There are 320 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 = 220
Number of adults = 1 u
Number of boys = 1 u + 320
Total number of people
= 220 + 1 u + 1 u + 320
= 1 u + 1 u + 220 + 320
= 2 u + 540
2 u + 540 = 950
2 u = 950 - 540
2 u = 410
1 u = 410 ÷ 2 = 205
Number of adults
= 1 u
= 205
(b)
Number of children
= 220 + 1 u + 320
= 220 + 205 + 320
= 745
(c)
Number of less adults than children
= 745 - 205
= 540
(d)
Number of more boys than girls
= 1 u + 320 - 220
= 205 + 320 - 220
= 305
Answer(s): (a) 205; (b) 745; (c) 540; (d) 305