Adam has 320 stickers in 3 colours.
75% of the stickers are red.
The number of blue stickers and green in the ratio of 1 : 4.
- What percentage of the stickers is green?
- How many blue stickers are there?
Red |
Blue |
Green |
Total |
3 x 5 |
1 x 5 |
4 x 5 |
|
1 x 1 |
4 x 1 |
|
15 u |
1 u |
4 u |
20 u |
(a)
75% =
75100 =
34 The number of blue and green stickers is the combined repeated identity.
Make the number of blue 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
=
420 x 100%
= 20%
(b)
Total number of stickers = 20 u
20 u = 320
1 u = 320 ÷ 20 = 16
Number of blue stickers
= 1 u
= 1 x 16
= 16
Answer(s): (a) 20%; (b) 16