Adam has some blue stickers and green stickers.
If 42 blue stickers are removed, 80% of the stickers will be green stickers.
If 563 green stickers are added, 10% of the stickers will be blue stickers.
- How many blue stickers are there?
- How many green stickers are there?
|
Scenario 1 |
Scenario 2 |
|
Blue |
Green |
Blue |
Green |
Before |
1 u + 42 |
4 u |
1 p |
9 p - 563 |
Change |
- 42 |
No change |
No change |
+ 563 |
After |
1 u |
4 u |
1 p |
9 p |
(a)
80% =
80100
=
45 10% =
10100 =
110 Scenario 1 Fraction of the stickers that are blue in the end
= 1 -
45 =
15 Scenario 2
Fraction of the stickers that are blue in the end
= 1 -
110 =
910 1 u + 42 = 1 p --- (1)
4 u = 9 p - 563 --- (2)
(1)
x 4 4 u + 168 = 4 p
4 u = 4 p - 168 --- (3)
(2) = (3)
9 p - 563 = 4 p - 168
9 p - 4 p = 563 - 168
5 p = 395
1 p = 395 ÷ 5 = 79
Number of blue stickers
= 1 p
= 1 x 79
= 79
(b)
Number of green stickers
= 9 p - 563
= 9 x 79 - 563
= 711 - 563
= 148
Answer(s): (a) 79; (b) 148