Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 10% to 66.
The number of red stickers is decreased by 40% to 87.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 10% |
- 40% |
After |
110% = 66 |
60% = 87 |
(a)
100% - 10% = 110%
110% of green stickers = 66
100% of green stickers =
66110 x 100 = 60
100% - 40% = 60%
60% of red stickers = 87
100% of red stickers =
8760 x 100 = 145
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 60 + 145
= 205
(b)
Number of stickers in the end
= 66 + 87
= 153
Answer(s): (a) 205; (b) 153