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 40% to 75.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 25% |
- 40% |
After |
125% = 50 |
60% = 75 |
(a)
100% - 25% = 125%
125% of red stickers = 50
100% of red stickers =
50125 x 100 = 40
100% - 40% = 60%
60% of green stickers = 75
100% of green stickers =
7560 x 100 = 125
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 40 + 125
= 165
(b)
Number of stickers in the end
= 50 + 75
= 125
Answer(s): (a) 165; (b) 125