Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 80.
The number of red stickers is decreased by 20% to 52.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 25% |
- 20% |
After |
125% = 80 |
80% = 52 |
(a)
100% - 25% = 125%
125% of red stickers = 80
100% of red stickers =
80125 x 100 = 64
100% - 20% = 80%
80% of blue stickers = 52
100% of blue stickers =
5280 x 100 = 65
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 64 + 65
= 129
(b)
Number of stickers in the end
= 80 + 52
= 132
Answer(s): (a) 129; (b) 132