There are 610 people,
of which 70 are girls.
There are 250 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 = 70
Number of adults = 1 u
Number of boys = 1 u + 250
Total number of people
= 70 + 1 u + 1 u + 250
= 1 u + 1 u + 70 + 250
= 2 u + 320
2 u + 320 = 610
2 u = 610 - 320
2 u = 290
1 u = 290 ÷ 2 = 145
Number of adults
= 1 u
= 145
(b)
Number of children
= 70 + 1 u + 250
= 70 + 145 + 250
= 465
(c)
Number of less adults than children
= 465 - 145
= 320
(d)
Number of more boys than girls
= 1 u + 250 - 70
= 145 + 250 - 70
= 325
Answer(s): (a) 145; (b) 465; (c) 320; (d) 325