Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 10% to 88.
The number of red stickers is decreased by 40% to 60.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 10% |
- 40% |
After |
110% = 88 |
60% = 60 |
(a)
100% - 10% = 110%
110% of blue stickers = 88
100% of blue stickers =
88110 x 100 = 80
100% - 40% = 60%
60% of red stickers = 60
100% of red stickers =
6060 x 100 = 100
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 80 + 100
= 180
(b)
Number of stickers in the end
= 88 + 60
= 148
Answer(s): (a) 180; (b) 148