The ratio of the number of girls to the number of boys is 4 : 7.
Each girl is given 9 stickers.
Each boy is given 3 stickers.
The total number of stickers is 399.
- 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 |
9 |
3 |
Total stickers |
36 u |
21 u |
(a)
Total number of stickers
= 36 u + 21 u
= 57 u
57 u = 399
1 u = 399 ÷ 57 = 7
Number of children
= 4 u + 7 u
= 11 u
= 11 x 7
= 77
(b)
Number of more boys than girls
= 7 u - 4 u
= 3 u
= 3 x 7
= 21
(c)
Number of more stickers given to the girls than boys
= 36 u - 21 u
= 15 u
= 15 x 7
= 105
Answer(s): (a) 77; (b) 21; (c) 105