The ratio of the number of girls to the number of boys is 4 : 7.
Each girl is given 7 stickers.
Each boy is given 3 stickers.
The total number of stickers is 539.
- 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 |
4 u |
7 u |
Stickers for each person |
7 |
3 |
Total stickers |
28 u |
21 u |
(a)
Total number of stickers
= 28 u + 21 u
= 49 u
49 u = 539
1 u = 539 ÷ 49 = 11
Number of children
= 4 u + 7 u
= 11 u
= 11 x 11
= 121
(b)
Number of more boys than girls
= 7 u - 4 u
= 3 u
= 3 x 11
= 33
(c)
Number of more stickers given to the girls than boys
= 28 u - 21 u
= 7 u
= 7 x 11
= 77
Answer(s): (a) 121; (b) 33; (c) 77