Adam has 400 stickers in 3 colours.
60% of the stickers are green.
The number of red stickers and blue in the ratio of 2 : 3.
- What percentage of the stickers is blue?
- How many red stickers are there?
Green |
Red |
Blue |
Total |
3 x 5 |
2 x 5 |
5 x 5 |
|
2 x 2 |
3 x 2 |
|
15 u |
4 u |
6 u |
25 u |
(a)
60% =
60100 =
35 The number of red and blue stickers is the combined repeated identity.
Make the number of red and blue stickers the same using the LCM of 2 and 5.
LCM of 2 and 5 = 10
Percentage of the stickers that is blue
=
625 x 100%
= 24%
(b)
Total number of stickers = 25 u
25 u = 400
1 u = 400 ÷ 25 = 16
Number of red stickers
= 4 u
= 4 x 16
= 64
Answer(s): (a) 24%; (b) 64