Adam has 160 stickers in 3 colours.
40% of the stickers are green.
The number of blue stickers and red in the ratio of 1 : 3.
- What percentage of the stickers is red?
- How many blue stickers are there?
Green |
Blue |
Red |
Total |
2 x 4 |
3 x 4 |
5 x 4 |
|
1 x 3 |
3 x 3 |
|
8 u |
3 u |
9 u |
20 u |
(a)
40% =
40100 =
25 The number of blue and red stickers is the combined repeated identity.
Make the number of blue and red stickers the same using the LCM of 3 and 4.
LCM of 3 and 4 = 12
Percentage of the stickers that is red
=
920 x 100%
= 45%
(b)
Total number of stickers = 20 u
20 u = 160
1 u = 160 ÷ 20 = 8
Number of blue stickers
= 3 u
= 3 x 8
= 24
Answer(s): (a) 45%; (b) 24