Adam has 200 stickers in 3 colours.
30% of the stickers are red.
The number of green stickers is
37 that of blue stickers.
- What percentage of the stickers is blue?
- How many green stickers are there?
Red |
Green |
Blue |
Total |
3 x 10 |
7 x 10 |
10 x 10 |
|
3 x 7 |
7 x 7 |
|
30 u |
21 u |
49 u |
100 u |
(a)
30% =
30100 =
310 The number of green and blue stickers is the combined repeated identity.
Make the number of green and blue stickers the same using the LCM of 7 and 10.
LCM of 7 and 10 = 70
Percentage of the stickers that is blue
=
49100 x 100%
= 49%
(b)
Total number of stickers = 100 u
100 u = 200
1 u = 200 ÷ 100 = 2
Number of green stickers
= 21 u
= 21 x 2
= 42
Answer(s): (a) 49%; (b) 42