Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 51.
The number of red stickers is decreased by 50% to 80.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Green |
Before |
100% |
100% |
Change |
- 40% |
- 50% |
After |
60% = 51 |
50% = 80 |
(a)
100% - 40% = 60%
60% of blue stickers = 51
100% of blue stickers =
5160 x 100 = 85
100% - 50% = 50%
50% of green stickers = 80
100% of green stickers =
8050 x 100 = 160
Number of stickers at first
= 100% of blue stickers + 100% of green stickers
= 85 + 160
= 245
(b)
Number of stickers in the end
= 51 + 80
= 131
Answer(s): (a) 245; (b) 131