Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 50.
The number of red stickers is decreased by 50% to 90.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 25% |
- 50% |
After |
125% = 50 |
50% = 90 |
(a)
100% - 25% = 125%
125% of red stickers = 50
100% of red stickers =
50125 x 100 = 40
100% - 50% = 50%
50% of green stickers = 90
100% of green stickers =
9050 x 100 = 180
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 40 + 180
= 220
(b)
Number of stickers in the end
= 50 + 90
= 140
Answer(s): (a) 220; (b) 140