Adam has 160 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 = 112 |
10 u = 160 |
|
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 = 160
1 u = 160 ÷ 10 = 16
Number of red stickers and blue stickers
= 7 u
= 7 x 16
= 112
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 = 112
2 p = 112 - 10
2 p = 102
1 p = 102 ÷ 2 = 51
Number of blue stickers
= 1 p
= 51
(b)
Number of red stickers
= 1 p + 10
= 51 + 10
= 61
Number of green stickers
= 3 u
= 3 x 16
= 48
Number of more red than green stickers
= 61 - 48
= 13
Answer(s): (a) 51; (b) 13