There are 550 people,
of which 80 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 = 80
Number of adults = 1 u
Number of girls = 1 u + 260
Total number of people
= 80 + 1 u + 1 u + 260
= 1 u + 1 u + 80 + 260
= 2 u + 340
2 u + 340 = 550
2 u = 550 - 340
2 u = 210
1 u = 210 ÷ 2 = 105
Number of adults
= 1 u
= 105
(b)
Number of children
= 80 + 1 u + 260
= 80 + 105 + 260
= 445
(c)
Number of less adults than children
= 445 - 105
= 340
(d)
Number of more girls than boys
= 1 u + 260 - 80
= 105 + 260 - 80
= 285
Answer(s): (a) 105; (b) 445; (c) 340; (d) 285