Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 40% to 91.
The number of red stickers is decreased by 20% to 60.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 40% |
- 20% |
After |
140% = 91 |
80% = 60 |
(a)
100% - 40% = 140%
140% of red stickers = 91
100% of red stickers =
91140 x 100 = 65
100% - 20% = 80%
80% of blue stickers = 60
100% of blue stickers =
6080 x 100 = 75
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 65 + 75
= 140
(b)
Number of stickers in the end
= 91 + 60
= 151
Answer(s): (a) 140; (b) 151