Adam has some blue stickers and red stickers.
If Adam receives another 81 blue stickers,
the blue stickers will be 25% as many as the red stickers.
If Adam gives away 423 red stickers,
the blue stickers will be 40% as many as the red stickers.
- How many blue stickers are there?
- How many red stickers are there?
|
Scenario 1 |
Scenario 2 |
|
Green |
Blue |
Green |
Blue |
Before |
1 u - 81 |
4 u |
2 p |
5 p + 423 |
Change |
+ 81 |
No change |
No change |
- 423 |
After |
1 u |
4 u |
2 p |
5 p |
(a)
25% =
25100 =
14 40% =
40100 =
25 Scenario 1 Number of green stickers at first = 1 u - 81
Number of blue stickers at first = 4 u
Scenario 2 Number of green stickers at first = 2 p
Number of blue stickers at first = 5 p + 423
1 u - 81 = 2 p --- (1)
4 u = 5 p + 423 --- (2)
From (1)1 u = 81 + 2 p --- (3) (3) x 44 u = 324 + 8 p --- (4)
(4) = (2)324 + 8 p = 5 p + 423 8 p - 5 p = 423 - 3243 p = 99
1 p = 99 ÷ 3 = 33
Number of blue stickers = 2 p = 2 x 33 = 66 (b) Number of red stickers = 5 p + 423 = 5 x 33 + 423
= 165 + 423= 588 Answer(s): (a) 66; (b) 588