Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 20% to 64.
The number of red stickers is decreased by 50% to 87.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
- 20% |
- 50% |
After |
80% = 64 |
50% = 87 |
(a)
100% - 20% = 80%
80% of green stickers = 64
100% of green stickers =
6480 x 100 = 80
100% - 50% = 50%
50% of red stickers = 87
100% of red stickers =
8750 x 100 = 174
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 80 + 174
= 254
(b)
Number of stickers in the end
= 64 + 87
= 151
Answer(s): (a) 254; (b) 151