The ratio of the number of girls to the number of boys is 5 : 7.
Each girl is given 5 stickers.
Each boy is given 2 stickers.
The total number of stickers is 78.
- 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 |
5 u |
7 u |
Stickers for each person |
5 |
2 |
Total stickers |
25 u |
14 u |
(a)
Total number of stickers
= 25 u + 14 u
= 39 u
39 u = 78
1 u = 78 ÷ 39 = 2
Number of children
= 5 u + 7 u
= 12 u
= 12 x 2
= 24
(b)
Number of more boys than girls
= 7 u - 5 u
= 2 u
= 2 x 2
= 4
(c)
Number of more stickers given to the girls than boys
= 25 u - 14 u
= 11 u
= 11 x 2
= 22
Answer(s): (a) 24; (b) 4; (c) 22