Adam has 150 stickers in 3 colours.
40% 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 |
2 x 5 |
3 x 5 |
5 x 5 |
|
2 x 3 |
3 x 3 |
|
10 u |
6 u |
9 u |
25 u |
(a)
40% =
40100 =
25 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 3 and 5.
LCM of 3 and 5 = 15
Percentage of the stickers that is blue
=
925 x 100%
= 36%
(b)
Total number of stickers = 25 u
25 u = 150
1 u = 150 ÷ 25 = 6
Number of red stickers
= 6 u
= 6 x 6
= 36
Answer(s): (a) 36%; (b) 36