Adam has 390 stickers in 3 colours.
40% of the stickers are blue.
The number of green stickers and red in the ratio of 1 : 5.
- What percentage of the stickers is red?
- How many green stickers are there?
Blue |
Green |
Red |
Total |
2 x 2 |
3 x 2 |
5 x 2 |
|
1 x 1 |
5 x 1 |
|
4 u |
1 u |
5 u |
10 u |
(a)
40% =
40100 =
25 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 3 and 6.
LCM of 3 and 6 = 6
Percentage of the stickers that is red
=
510 x 100%
= 50%
(b)
Total number of stickers = 10 u
10 u = 390
1 u = 390 ÷ 10 = 39
Number of green stickers
= 1 u
= 1 x 39
= 39
Answer(s): (a) 50%; (b) 39