Adam has 280 stickers in 3 colours.
75% of the stickers are blue.
The number of red stickers and green in the ratio of 2 : 3.
- What percentage of the stickers is green?
- How many red stickers are there?
Blue |
Red |
Green |
Total |
3 x 5 |
1 x 5 |
4 x 5 |
|
2 x 1 |
3 x 1 |
|
15 u |
2 u |
3 u |
20 u |
(a)
75% =
75100 =
34 The number of red and green stickers is the combined repeated identity.
Make the number of red and green stickers the same using the LCM of 1 and 5.
LCM of 1 and 5 = 5
Percentage of the stickers that is green
=
320 x 100%
= 15%
(b)
Total number of stickers = 20 u
20 u = 280
1 u = 280 ÷ 20 = 14
Number of red stickers
= 2 u
= 2 x 14
= 28
Answer(s): (a) 15%; (b) 28