Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 87.
The number of red stickers is decreased by 20% to 84.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
- 40% |
- 20% |
After |
60% = 87 |
80% = 84 |
(a)
100% - 40% = 60%
60% of green stickers = 87
100% of green stickers =
8760 x 100 = 145
100% - 20% = 80%
80% of blue stickers = 84
100% of blue stickers =
8480 x 100 = 105
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 145 + 105
= 250
(b)
Number of stickers in the end
= 87 + 84
= 171
Answer(s): (a) 250; (b) 171