Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 70.
The number of red stickers is decreased by 20% to 68.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 25% |
- 20% |
After |
125% = 70 |
80% = 68 |
(a)
100% - 25% = 125%
125% of red stickers = 70
100% of red stickers =
70125 x 100 = 56
100% - 20% = 80%
80% of green stickers = 68
100% of green stickers =
6880 x 100 = 85
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 56 + 85
= 141
(b)
Number of stickers in the end
= 70 + 68
= 138
Answer(s): (a) 141; (b) 138