Adam has 200 stickers in 3 colours.
40% of the stickers are blue.
The number of green stickers and red in the ratio of 1 : 4.
- What percentage of the stickers is red?
- How many green stickers are there?
Blue |
Green |
Red |
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 green and red stickers is the combined repeated identity.
Make the number of green and red stickers the same using the LCM of 3 and 5.
LCM of 3 and 5 = 15
Percentage of the stickers that is red
=
1225 x 100%
= 48%
(b)
Total number of stickers = 25 u
25 u = 200
1 u = 200 ÷ 25 = 8
Number of green stickers
= 3 u
= 3 x 8
= 24
Answer(s): (a) 48%; (b) 24