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 20% to 64.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 35% |
- 20% |
After |
135% = 81 |
80% = 64 |
(a)
100% - 35% = 135%
135% of green stickers = 81
100% of green stickers =
81135 x 100 = 60
100% - 20% = 80%
80% of blue stickers = 64
100% of blue stickers =
6480 x 100 = 80
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 60 + 80
= 140
(b)
Number of stickers in the end
= 81 + 64
= 145
Answer(s): (a) 140; (b) 145