Adam has 150 stickers in 3 colours.
30% of the stickers are green.
The number of blue stickers and red in the ratio of 2 : 3.
- What percentage of the stickers is red?
- How many blue stickers are there?
Green |
Blue |
Red |
Total |
3 x 5 |
7 x 5 |
10 x 5 |
|
2 x 7 |
3 x 7 |
|
15 u |
14 u |
21 u |
50 u |
(a)
30% =
30100 =
310 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 7 and 5.
LCM of 7 and 5 = 35
Percentage of the stickers that is red
=
2150 x 100%
= 42%
(b)
Total number of stickers = 50 u
50 u = 150
1 u = 150 ÷ 50 = 3
Number of blue stickers
= 14 u
= 14 x 3
= 42
Answer(s): (a) 42%; (b) 42