Adam has 200 red stickers, green stickers and blue stickers.
15% of the stickers are red.
There are 10 more green stickers than blue stickers.
- How many blue stickers are there?
- How many less red stickers than green stickers?
Red |
Green |
Blue |
Total |
3 u |
17 u = 170 |
20 u = 200 |
|
1 p + 10 |
1 p |
|
(a)
15% =
15100 =
320 Total number of stickers = 20 u
Number of red stickers = 3 u
Number of green and blue stickers
= 20 u - 3 u
= 17 u
20 u = 200
1 u = 200 ÷ 20 = 10
Number of green stickers and blue stickers
= 17 u
= 17 x 10
= 170
Number of blue stickers = 1 p
Number of green stickers = 1 p + 10
Total number of green and blue stickers
= 1 p + 1 p + 10
= 2 p + 10
2 p + 10 = 170
2 p = 170 - 10
2 p = 160
1 p = 160 ÷ 2 = 80
Number of blue stickers
= 1 p
= 80
(b)
Number of red stickers
= 3 u
= 3 x 10
= 30
Number of green stickers
= 1 p + 10
= 80 + 10
= 90
Number of less red stickers than green stickers
= 90 - 30
= 60
Answer(s): (a) 80; (b) 60