There are 810 people,
of which 230 are boys.
There are 260 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 = 230
Number of adults = 1 u
Number of girls = 1 u + 260
Total number of people
= 230 + 1 u + 1 u + 260
= 1 u + 1 u + 230 + 260
= 2 u + 490
2 u + 490 = 810
2 u = 810 - 490
2 u = 320
1 u = 320 ÷ 2 = 160
Number of adults
= 1 u
= 160
(b)
Number of children
= 230 + 1 u + 260
= 230 + 160 + 260
= 650
(c)
Number of less adults than children
= 650 - 160
= 490
(d)
Number of more girls than boys
= 1 u + 260 - 230
= 160 + 260 - 230
= 190
Answer(s): (a) 160; (b) 650; (c) 490; (d) 190