Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 5% to 57.
The number of red stickers is decreased by 20% to 68.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
- 5% |
- 20% |
After |
95% = 57 |
80% = 68 |
(a)
100% - 5% = 95%
95% of red stickers = 57
100% of red stickers =
5795 x 100 = 60
100% - 20% = 80%
80% of blue stickers = 68
100% of blue stickers =
6880 x 100 = 85
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 60 + 85
= 145
(b)
Number of stickers in the end
= 57 + 68
= 125
Answer(s): (a) 145; (b) 125