There are 990 people,
of which 140 are girls.
There are 640 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 = 140
Number of adults = 1 u
Number of boys = 1 u + 640
Total number of people
= 140 + 1 u + 1 u + 640
= 1 u + 1 u + 140 + 640
= 2 u + 780
2 u + 780 = 990
2 u = 990 - 780
2 u = 210
1 u = 210 ÷ 2 = 105
Number of adults
= 1 u
= 105
(b)
Number of children
= 140 + 1 u + 640
= 140 + 105 + 640
= 885
(c)
Number of less adults than children
= 885 - 105
= 780
(d)
Number of more boys than girls
= 1 u + 640 - 140
= 105 + 640 - 140
= 605
Answer(s): (a) 105; (b) 885; (c) 780; (d) 605