Adam has 200 stickers in 3 colours.
25% of the stickers are green.
The number of blue stickers and red in the ratio of 2 : 3.
- What percentage of the stickers is red?
- How many blue stickers are there?
Green |
Blue |
Red |
Total |
1 x 5 |
3 x 5 |
4 x 5 |
|
2 x 3 |
3 x 3 |
|
5 u |
6 u |
9 u |
20 u |
(a)
25% =
25100 =
14 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 3 and 5.
LCM of 3 and 5 = 15
Percentage of the stickers that is red
=
920 x 100%
= 45%
(b)
Total number of stickers = 20 u
20 u = 200
1 u = 200 ÷ 20 = 10
Number of blue stickers
= 6 u
= 6 x 10
= 60
Answer(s): (a) 45%; (b) 60