Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 20% to 60.
The number of red stickers is decreased by 50% to 81.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
- 20% |
- 50% |
After |
80% = 60 |
50% = 81 |
(a)
100% - 20% = 80%
80% of green stickers = 60
100% of green stickers =
6080 x 100 = 75
100% - 50% = 50%
50% of blue stickers = 81
100% of blue stickers =
8150 x 100 = 162
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 75 + 162
= 237
(b)
Number of stickers in the end
= 60 + 81
= 141
Answer(s): (a) 237; (b) 141