Adam has 300 stickers in 3 colours.
60% of the stickers are blue.
The number of green stickers and red in the ratio of 1 : 7.
- What percentage of the stickers is red?
- How many green stickers are there?
Blue |
Green |
Red |
Total |
3 x 4 |
2 x 4 |
5 x 4 |
|
1 x 1 |
7 x 1 |
|
12 u |
1 u |
7 u |
20 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 8.
LCM of 2 and 8 = 8
Percentage of the stickers that is red
=
720 x 100%
= 35%
(b)
Total number of stickers = 20 u
20 u = 300
1 u = 300 ÷ 20 = 15
Number of green stickers
= 1 u
= 1 x 15
= 15
Answer(s): (a) 35%; (b) 15