Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 75.
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 |
Red |
Before |
100% |
100% |
Change |
+ 25% |
- 50% |
After |
125% = 75 |
50% = 80 |
(a)
100% - 25% = 125%
125% of blue stickers = 75
100% of blue stickers =
75125 x 100 = 60
100% - 50% = 50%
50% of red stickers = 80
100% of red stickers =
8050 x 100 = 160
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 60 + 160
= 220
(b)
Number of stickers in the end
= 75 + 80
= 155
Answer(s): (a) 220; (b) 155