Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 20% to 88.
The number of red stickers is decreased by 10% to 99.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 20% |
- 10% |
After |
80% = 88 |
90% = 99 |
(a)
100% - 20% = 80%
80% of blue stickers = 88
100% of blue stickers =
8880 x 100 = 110
100% - 10% = 90%
90% of red stickers = 99
100% of red stickers =
9990 x 100 = 110
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 110 + 110
= 220
(b)
Number of stickers in the end
= 88 + 99
= 187
Answer(s): (a) 220; (b) 187