Adam has 300 stickers in 3 colours.
60% 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 |
3 x 5 |
2 x 5 |
5 x 5 |
|
3 x 1 |
7 x 1 |
|
15 u |
3 u |
7 u |
25 u |
(a)
60% =
60100 =
35 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 2 and 10.
LCM of 2 and 10 = 10
Percentage of the stickers that is red
=
725 x 100%
= 28%
(b)
Total number of stickers = 25 u
25 u = 300
1 u = 300 ÷ 25 = 12
Number of green stickers
= 3 u
= 3 x 12
= 36
Answer(s): (a) 28%; (b) 36