Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 57.
The number of red stickers is decreased by 50% to 83.
- 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% = 57 |
50% = 83 |
(a)
100% - 40% = 60%
60% of green stickers = 57
100% of green stickers =
5760 x 100 = 95
100% - 50% = 50%
50% of red stickers = 83
100% of red stickers =
8350 x 100 = 166
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 95 + 166
= 261
(b)
Number of stickers in the end
= 57 + 83
= 140
Answer(s): (a) 261; (b) 140