Adam has 250 stickers in 3 colours.
60% of the stickers are red.
The number of blue stickers and green in the ratio of 3 : 7.
- What percentage of the stickers is green?
- How many blue stickers are there?
Red |
Blue |
Green |
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 blue and green stickers is the combined repeated identity.
Make the number of blue and green stickers the same using the LCM of 2 and 10.
LCM of 2 and 10 = 10
Percentage of the stickers that is green
=
725 x 100%
= 28%
(b)
Total number of stickers = 25 u
25 u = 250
1 u = 250 ÷ 25 = 10
Number of blue stickers
= 3 u
= 3 x 10
= 30
Answer(s): (a) 28%; (b) 30