Adam has 150 stickers in 3 colours.
20% of the stickers are red.
The number of green stickers and blue in the ratio of 1 : 4.
- What percentage of the stickers is blue?
- How many green stickers are there?
Red |
Green |
Blue |
Total |
1 x 5 |
4 x 5 |
5 x 5 |
|
1 x 4 |
4 x 4 |
|
5 u |
4 u |
16 u |
25 u |
(a)
20% =
20100 =
15 The number of green and blue stickers is the combined repeated identity.
Make the number of green and blue stickers the same using the LCM of 4 and 5.
LCM of 4 and 5 = 20
Percentage of the stickers that is blue
=
1625 x 100%
= 64%
(b)
Total number of stickers = 25 u
25 u = 150
1 u = 150 ÷ 25 = 6
Number of green stickers
= 4 u
= 4 x 6
= 24
Answer(s): (a) 64%; (b) 24