There are 940 people,
of which 280 are boys.
There are 320 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 = 280
Number of adults = 1 u
Number of girls = 1 u + 320
Total number of people
= 280 + 1 u + 1 u + 320
= 1 u + 1 u + 280 + 320
= 2 u + 600
2 u + 600 = 940
2 u = 940 - 600
2 u = 340
1 u = 340 ÷ 2 = 170
Number of adults
= 1 u
= 170
(b)
Number of children
= 280 + 1 u + 320
= 280 + 170 + 320
= 770
(c)
Number of less adults than children
= 770 - 170
= 600
(d)
Number of more girls than boys
= 1 u + 320 - 280
= 170 + 320 - 280
= 210
Answer(s): (a) 170; (b) 770; (c) 600; (d) 210