Adam has 300 stickers in 3 colours.
60% of the stickers are green.
The number of blue stickers and red in the ratio of 1 : 3.
- What percentage of the stickers is red?
- How many blue stickers are there?
Green |
Blue |
Red |
Total |
3 x 2 |
2 x 2 |
5 x 2 |
|
1 x 1 |
3 x 1 |
|
6 u |
1 u |
3 u |
10 u |
(a)
60% =
60100 =
35 The number of blue and red stickers is the combined repeated identity.
Make the number of blue and red stickers the same using the LCM of 2 and 4.
LCM of 2 and 4 = 4
Percentage of the stickers that is red
=
310 x 100%
= 30%
(b)
Total number of stickers = 10 u
10 u = 300
1 u = 300 ÷ 10 = 30
Number of blue stickers
= 1 u
= 1 x 30
= 30
Answer(s): (a) 30%; (b) 30