Adam has some green stickers and blue stickers.
If Adam receives another 512 blue stickers,
the green stickers will be 25% as many as the blue stickers.
If Adam receives another 20 green stickers,
the green stickers will be 75% as many as the blue stickers.
- How many green stickers are there?
- How many blue stickers are there?
|
Scenario 1 |
Scenario 2 |
|
Green |
Blue |
Green |
Blue |
Before |
1 u |
4 u - 512 |
3 p - 20 |
4 p |
Change |
No change |
+ 512 |
+ 20 |
No change |
After |
1 u |
4 u |
3 p |
4 p |
(a)
25% =
25100 =
14 75% =
75100 =
34 Scenario 1 Number of green stickers at first = 1 u
Number of blue stickers at first = 4 u - 512
Scenario 2 Number of green stickers at first = 3 p - 20
Number of blue stickers at first = 4 p
1 u = 3 p - 20 --- (1)
4 u - 512 = 4 p --- (2)
(2)
÷ 41 u - 128 = 1 p
1 u = 1 p + 128 --- (3)
(1) = (3)
3 p - 20 = 1 p + 128
3 p - 1 p = 20 + 128
2 p = 148
1 p = 148 ÷ 2 = 74
Number of green stickers
= 3 p - 20
= 3 x 74 - 20
= 222 - 20
= 202
(b)
Number of blue stickers
= 4 p
= 4 x 74
= 296
Answer(s): (a) 202; (b) 296