Adam has 250 stickers in 3 colours.
20% of the stickers are blue.
The number of green stickers and red in the ratio of 3 : 7.
- What percentage of the stickers is red?
- How many green stickers are there?
Blue |
Green |
Red |
Total |
1 x 5 |
4 x 5 |
5 x 5 |
|
3 x 2 |
7 x 2 |
|
5 u |
6 u |
14 u |
25 u |
(a)
20% =
20100 =
15 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 4 and 10.
LCM of 4 and 10 = 20
Percentage of the stickers that is red
=
1425 x 100%
= 56%
(b)
Total number of stickers = 25 u
25 u = 250
1 u = 250 ÷ 25 = 10
Number of green stickers
= 6 u
= 6 x 10
= 60
Answer(s): (a) 56%; (b) 60