Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 81.
The number of red stickers is decreased by 20% to 52.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 40% |
- 20% |
After |
60% = 81 |
80% = 52 |
(a)
100% - 40% = 60%
60% of blue stickers = 81
100% of blue stickers =
8160 x 100 = 135
100% - 20% = 80%
80% of red stickers = 52
100% of red stickers =
5280 x 100 = 65
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 135 + 65
= 200
(b)
Number of stickers in the end
= 81 + 52
= 133
Answer(s): (a) 200; (b) 133