Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 25% to 57.
The number of red stickers is decreased by 20% to 80.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
- 25% |
- 20% |
After |
75% = 57 |
80% = 80 |
(a)
100% - 25% = 75%
75% of red stickers = 57
100% of red stickers =
5775 x 100 = 76
100% - 20% = 80%
80% of blue stickers = 80
100% of blue stickers =
8080 x 100 = 100
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 76 + 100
= 176
(b)
Number of stickers in the end
= 57 + 80
= 137
Answer(s): (a) 176; (b) 137