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 54.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 10% |
- 40% |
After |
110% = 66 |
60% = 54 |
(a)
100% - 10% = 110%
110% of red stickers = 66
100% of red stickers =
66110 x 100 = 60
100% - 40% = 60%
60% of green stickers = 54
100% of green stickers =
5460 x 100 = 90
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 60 + 90
= 150
(b)
Number of stickers in the end
= 66 + 54
= 120
Answer(s): (a) 150; (b) 120