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 80.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 25% |
- 20% |
After |
125% = 70 |
80% = 80 |
(a)
100% - 25% = 125%
125% of green stickers = 70
100% of green stickers =
70125 x 100 = 56
100% - 20% = 80%
80% of blue stickers = 80
100% of blue stickers =
8080 x 100 = 100
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 56 + 100
= 156
(b)
Number of stickers in the end
= 70 + 80
= 150
Answer(s): (a) 156; (b) 150