Adam has 120 stickers in 3 colours.
20% of the stickers are blue.
The number of red stickers and green in the ratio of 3 : 5.
- What percentage of the stickers is green?
- How many red stickers are there?
Blue |
Red |
Green |
Total |
1 x 2 |
4 x 2 |
5 x 2 |
|
3 x 1 |
5 x 1 |
|
2 u |
3 u |
5 u |
10 u |
(a)
20% =
20100 =
15 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 4 and 8.
LCM of 4 and 8 = 8
Percentage of the stickers that is green
=
510 x 100%
= 50%
(b)
Total number of stickers = 10 u
10 u = 120
1 u = 120 ÷ 10 = 12
Number of red stickers
= 3 u
= 3 x 12
= 36
Answer(s): (a) 50%; (b) 36