Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 10% to 54.
The number of red stickers is decreased by 50% to 56.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 10% |
- 50% |
After |
90% = 54 |
50% = 56 |
(a)
100% - 10% = 90%
90% of blue stickers = 54
100% of blue stickers =
5490 x 100 = 60
100% - 50% = 50%
50% of red stickers = 56
100% of red stickers =
5650 x 100 = 112
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 60 + 112
= 172
(b)
Number of stickers in the end
= 54 + 56
= 110
Answer(s): (a) 172; (b) 110