There are 630 people,
of which 160 are boys.
There are 280 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 = 160
Number of adults = 1 u
Number of girls = 1 u + 280
Total number of people
= 160 + 1 u + 1 u + 280
= 1 u + 1 u + 160 + 280
= 2 u + 440
2 u + 440 = 630
2 u = 630 - 440
2 u = 190
1 u = 190 ÷ 2 = 95
Number of adults
= 1 u
= 95
(b)
Number of children
= 160 + 1 u + 280
= 160 + 95 + 280
= 535
(c)
Number of less adults than children
= 535 - 95
= 440
(d)
Number of more girls than boys
= 1 u + 280 - 160
= 95 + 280 - 160
= 215
Answer(s): (a) 95; (b) 535; (c) 440; (d) 215