Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 35% to 81.
The number of red stickers is decreased by 50% to 66.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 35% |
- 50% |
After |
135% = 81 |
50% = 66 |
(a)
100% - 35% = 135%
135% of red stickers = 81
100% of red stickers =
81135 x 100 = 60
100% - 50% = 50%
50% of green stickers = 66
100% of green stickers =
6650 x 100 = 132
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 60 + 132
= 192
(b)
Number of stickers in the end
= 81 + 66
= 147
Answer(s): (a) 192; (b) 147