Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 100.
The number of red stickers is decreased by 50% to 91.
- 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% = 100 |
50% = 91 |
(a)
100% - 25% = 125%
125% of red stickers = 100
100% of red stickers =
100125 x 100 = 80
100% - 50% = 50%
50% of blue stickers = 91
100% of blue stickers =
9150 x 100 = 182
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 80 + 182
= 262
(b)
Number of stickers in the end
= 100 + 91
= 191
Answer(s): (a) 262; (b) 191