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 30% to 84.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 10% |
- 30% |
After |
110% = 66 |
70% = 84 |
(a)
100% - 10% = 110%
110% of blue stickers = 66
100% of blue stickers =
66110 x 100 = 60
100% - 30% = 70%
70% of red stickers = 84
100% of red stickers =
8470 x 100 = 120
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 60 + 120
= 180
(b)
Number of stickers in the end
= 66 + 84
= 150
Answer(s): (a) 180; (b) 150