Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 72.
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?
|
Green |
Red |
Before |
100% |
100% |
Change |
- 40% |
- 50% |
After |
60% = 72 |
50% = 73 |
(a)
100% - 40% = 60%
60% of green stickers = 72
100% of green stickers =
7260 x 100 = 120
100% - 50% = 50%
50% of red stickers = 73
100% of red stickers =
7350 x 100 = 146
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 120 + 146
= 266
(b)
Number of stickers in the end
= 72 + 73
= 145
Answer(s): (a) 266; (b) 145