Adam has 370 stickers in 3 colours.
60% of the stickers are blue.
The number of green stickers and red in the ratio of 1 : 3.
- What percentage of the stickers is red?
- How many green stickers are there?
Blue |
Green |
Red |
Total |
3 x 2 |
2 x 2 |
5 x 2 |
|
1 x 1 |
3 x 1 |
|
6 u |
1 u |
3 u |
10 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 4.
LCM of 2 and 4 = 4
Percentage of the stickers that is red
=
310 x 100%
= 30%
(b)
Total number of stickers = 10 u
10 u = 370
1 u = 370 ÷ 10 = 37
Number of green stickers
= 1 u
= 1 x 37
= 37
Answer(s): (a) 30%; (b) 37