Adam has 150 stickers in 3 colours.
40% of the stickers are blue.
The number of red stickers and green in the ratio of 1 : 4.
- What percentage of the stickers is green?
- How many red stickers are there?
Blue |
Red |
Green |
Total |
2 x 5 |
3 x 5 |
5 x 5 |
|
1 x 3 |
4 x 3 |
|
10 u |
3 u |
12 u |
25 u |
(a)
40% =
40100 =
25 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 3 and 5.
LCM of 3 and 5 = 15
Percentage of the stickers that is green
=
1225 x 100%
= 48%
(b)
Total number of stickers = 25 u
25 u = 150
1 u = 150 ÷ 25 = 6
Number of red stickers
= 3 u
= 3 x 6
= 18
Answer(s): (a) 48%; (b) 18