Adam has 400 stickers in 3 colours.
30% of the stickers are green.
The number of red stickers and blue in the ratio of 1 : 4.
- What percentage of the stickers is blue?
- How many red stickers are there?
Green |
Red |
Blue |
Total |
3 x 5 |
7 x 5 |
10 x 5 |
|
1 x 7 |
4 x 7 |
|
15 u |
7 u |
28 u |
50 u |
(a)
30% =
30100 =
310 The number of red and blue stickers is the combined repeated identity.
Make the number of red and blue stickers the same using the LCM of 7 and 5.
LCM of 7 and 5 = 35
Percentage of the stickers that is blue
=
2850 x 100%
= 56%
(b)
Total number of stickers = 50 u
50 u = 400
1 u = 400 ÷ 50 = 8
Number of red stickers
= 7 u
= 7 x 8
= 56
Answer(s): (a) 56%; (b) 56