There are 430 people,
of which 30 are girls.
There are 230 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 = 30
Number of adults = 1 u
Number of boys = 1 u + 230
Total number of people
= 30 + 1 u + 1 u + 230
= 1 u + 1 u + 30 + 230
= 2 u + 260
2 u + 260 = 430
2 u = 430 - 260
2 u = 170
1 u = 170 ÷ 2 = 85
Number of adults
= 1 u
= 85
(b)
Number of children
= 30 + 1 u + 230
= 30 + 85 + 230
= 345
(c)
Number of less adults than children
= 345 - 85
= 260
(d)
Number of more boys than girls
= 1 u + 230 - 30
= 85 + 230 - 30
= 285
Answer(s): (a) 85; (b) 345; (c) 260; (d) 285