The ratio of the number of girls to the number of boys is 3 : 7.
Each girl is given 7 stickers.
Each boy is given 2 stickers.
The total number of stickers is 140.
- How many children are there?
- How many more boys than girls are there?
- How many more stickers are given to the girls than the boys?
|
Girls |
Boys |
Number |
3 u |
7 u |
Stickers for each person |
7 |
2 |
Total stickers |
21 u |
14 u |
(a)
Total number of stickers
= 21 u + 14 u
= 35 u
35 u = 140
1 u = 140 ÷ 35 = 4
Number of children
= 3 u + 7 u
= 10 u
= 10 x 4
= 40
(b)
Number of more boys than girls
= 7 u - 3 u
= 4 u
= 4 x 4
= 16
(c)
Number of more stickers given to the girls than boys
= 21 u - 14 u
= 7 u
= 7 x 4
= 28
Answer(s): (a) 40; (b) 16; (c) 28