Adam has some blue stickers and green stickers.
If 160 blue stickers are removed, 70% of the stickers will be green stickers.
If 85 blue stickers are removed, 40% of the stickers will be green stickers.
- How many blue stickers are there?
- How many green stickers are there?
|
Scenario 1 |
Scenario 2 |
|
Blue |
Green |
Blue |
Green |
Before |
6 u + 160 |
14 u |
21 u + 85 |
14 u |
Change |
- 160 |
No change |
- 85 |
No change |
After |
3x2 = 6 u |
7x2 = 14 u |
3x7 = 21 u |
2x7 = 14 u |
(a)
70% =
70100 =
71040% =
40100 =
25Scenario 1 Fraction of the stickers that are blue in the end
= 1 -
710 =
310 Scenario 2
Fraction of the stickers that are blue in the end
= 1 -
25 =
35 The number of green stickers remains unchanged in both scenarios.
LCM of 7 and 2 = 14
6 u + 160 = 21 u + 85
21 u - 6 u = 160 - 85
15 u = 75
1 u = 75 ÷ 15 = 5
Number of blue stickers
= 6 u + 160
= 6 x 5 + 160
= 30 + 160
= 190
(b)
Number of green stickers
= 14 u
= 14 x 5
= 70
Answer(s): (a) 190; (b) 70