There are 980 people,
of which 240 are boys.
There are 400 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 = 240
Number of adults = 1 u
Number of girls = 1 u + 400
Total number of people
= 240 + 1 u + 1 u + 400
= 1 u + 1 u + 240 + 400
= 2 u + 640
2 u + 640 = 980
2 u = 980 - 640
2 u = 340
1 u = 340 ÷ 2 = 170
Number of adults
= 1 u
= 170
(b)
Number of children
= 240 + 1 u + 400
= 240 + 170 + 400
= 810
(c)
Number of less adults than children
= 810 - 170
= 640
(d)
Number of more girls than boys
= 1 u + 400 - 240
= 170 + 400 - 240
= 330
Answer(s): (a) 170; (b) 810; (c) 640; (d) 330