Adam has 170 blue stickers, yellow stickers, green stickers and red stickers.
5% of the stickers are blue.
15% of the stickers are yellow.
The rest are green and red stickers.
There are 10 more green stickers than red stickers.
- How many red stickers are there?
- How many more yellow stickers than blue stickers?
Blue
|
Yellow
|
Green
|
Red
|
Total
|
1 u |
3 u |
16 u
|
20 u
|
|
|
1 p + 10 |
1 p |
|
(a)
5% =
5100 =
120 15% =
15100 =
320 Number of green and red stickers
= 20 u - 1 u - 3 u
= 16 u
20 u = 170
1 u = 170 ÷ 20 = 8.5
Number of green and red stickers
= 16 u
= 16 x 8.5
= 136
16 u = 2 p + 10
2 p + 10 = 136
2 p = 136 - 10
2 p = 126
1 p = 126 ÷ 2 = 63
Number of red stickers
= 1 p
= 63
(b)
Number of more yellow stickers than blue stickers
= 3 u - 1 u
= 2 u
= 2 x 8.5
= 17
Answer(s): (a) 63; (b) 17