Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 10% to 99.
The number of red stickers is decreased by 50% to 73.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 10% |
- 50% |
After |
110% = 99 |
50% = 73 |
(a)
100% - 10% = 110%
110% of blue stickers = 99
100% of blue stickers =
99110 x 100 = 90
100% - 50% = 50%
50% of red stickers = 73
100% of red stickers =
7350 x 100 = 146
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 90 + 146
= 236
(b)
Number of stickers in the end
= 99 + 73
= 172
Answer(s): (a) 236; (b) 172