Adam has 320 stickers in 3 colours.
40% of the stickers are red.
The number of green stickers and blue in the ratio of 1 : 3.
- What percentage of the stickers is blue?
- How many green stickers are there?
Red |
Green |
Blue |
Total |
2 x 4 |
3 x 4 |
5 x 4 |
|
1 x 3 |
3 x 3 |
|
8 u |
3 u |
9 u |
20 u |
(a)
40% =
40100 =
25 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 3 and 4.
LCM of 3 and 4 = 12
Percentage of the stickers that is blue
=
920 x 100%
= 45%
(b)
Total number of stickers = 20 u
20 u = 320
1 u = 320 ÷ 20 = 16
Number of green stickers
= 3 u
= 3 x 16
= 48
Answer(s): (a) 45%; (b) 48