Adam has some blue stickers and red stickers.
If Adam receives another 87 blue stickers,
the blue stickers will be 25% as many as the red stickers.
If Adam gives away 660 red stickers,
the blue stickers will be 75% as many as the red stickers.
- How many blue stickers are there?
- How many red stickers are there?
|
Scenario 1 |
Scenario 2 |
|
Blue |
Green |
Blue |
Green |
Before |
1 u - 87 |
4 u |
3 p |
4 p + 660 |
Change |
+ 87 |
No change |
No change |
- 660 |
After |
1 u |
4 u |
3 p |
4 p |
(a)
25% =
25100 =
14 75% =
75100 =
34 Scenario 1 Number of blue stickers at first = 1 u - 87
Number of green stickers at first = 4 u
Scenario 2 Number of blue stickers at first = 3 p
Number of green stickers at first = 4 p + 660
1 u - 87 = 3 p --- (1)
4 u = 4 p + 660 --- (2)
From (1)1 u = 87 + 3 p --- (3) (3) x 44 u = 348 + 12 p --- (4)
(4) = (2)348 + 12 p = 4 p + 660 12 p - 4 p = 660 - 3488 p = 312
1 p = 312 ÷ 8 = 39
Number of blue stickers = 3 p = 3 x 39 = 117 (b) Number of red stickers = 4 p + 660 = 4 x 39 + 660
= 156 + 660= 816 Answer(s): (a) 117; (b) 816