Adam has 200 stickers in 3 colours.
75% of the stickers are blue.
The number of green stickers and red in the ratio of 1 : 4.
- What percentage of the stickers is red?
- How many green stickers are there?
Blue |
Green |
Red |
Total |
3 x 5 |
1 x 5 |
4 x 5 |
|
1 x 1 |
4 x 1 |
|
15 u |
1 u |
4 u |
20 u |
(a)
75% =
75100 =
34 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 1 and 5.
LCM of 1 and 5 = 5
Percentage of the stickers that is red
=
420 x 100%
= 20%
(b)
Total number of stickers = 20 u
20 u = 200
1 u = 200 ÷ 20 = 10
Number of green stickers
= 1 u
= 1 x 10
= 10
Answer(s): (a) 20%; (b) 10