Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 90.
The number of red stickers is decreased by 50% to 67.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 25% |
- 50% |
After |
125% = 90 |
50% = 67 |
(a)
100% - 25% = 125%
125% of red stickers = 90
100% of red stickers =
90125 x 100 = 72
100% - 50% = 50%
50% of blue stickers = 67
100% of blue stickers =
6750 x 100 = 134
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 72 + 134
= 206
(b)
Number of stickers in the end
= 90 + 67
= 157
Answer(s): (a) 206; (b) 157