Adam has 200 red stickers, green stickers and blue stickers.
30% of the stickers are red.
There are 10 more green stickers than blue stickers.
- How many blue stickers are there?
- How many more green stickers than red stickers?
Red |
Green |
Blue |
Total |
3 u |
7 u = 140 |
10 u = 200 |
|
1 p + 10 |
1 p |
|
(a)
30% =
30100 =
310 Total number of stickers = 10 u
Number of red stickers = 3 u
Number of green and blue stickers
= 10 u - 3 u
= 7 u
10 u = 200
1 u = 200 ÷ 10 = 20
Number of green stickers and blue stickers
= 7 u
= 7 x 20
= 140
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 = 140
2 p = 140 - 10
2 p = 130
1 p = 130 ÷ 2 = 65
Number of blue stickers
= 1 p
= 65
(b)
Number of green stickers
= 1 p + 10
= 65 + 10
= 75
Number of red stickers
= 3 u
= 3 x 20
= 60
Number of more green than red stickers
= 75 - 60
= 15
Answer(s): (a) 65; (b) 15