Adam has 140 green stickers, red stickers and blue stickers.
30% of the stickers are green.
There are 10 more red stickers than blue stickers.
- How many blue stickers are there?
- How many more red stickers than green stickers?
Green |
Red |
Blue |
Total |
3 u |
7 u = 98 |
10 u = 140 |
|
1 p + 10 |
1 p |
|
(a)
30% =
30100 =
310 Total number of stickers = 10 u
Number of green stickers = 3 u
Number of red and blue stickers
= 10 u - 3 u
= 7 u
10 u = 140
1 u = 140 ÷ 10 = 14
Number of red stickers and blue stickers
= 7 u
= 7 x 14
= 98
Number of blue stickers = 1 p
Number of red stickers = 1 p + 10
Total number of red and blue stickers
= 1 p + 1 p + 10
= 2 p + 10
2 p + 10 = 98
2 p = 98 - 10
2 p = 88
1 p = 88 ÷ 2 = 44
Number of blue stickers
= 1 p
= 44
(b)
Number of red stickers
= 1 p + 10
= 44 + 10
= 54
Number of green stickers
= 3 u
= 3 x 14
= 42
Number of more red than green stickers
= 54 - 42
= 12
Answer(s): (a) 44; (b) 12