Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 69.
The number of red stickers is decreased by 50% to 71.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
- 40% |
- 50% |
After |
60% = 69 |
50% = 71 |
(a)
100% - 40% = 60%
60% of green stickers = 69
100% of green stickers =
6960 x 100 = 115
100% - 50% = 50%
50% of blue stickers = 71
100% of blue stickers =
7150 x 100 = 142
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 115 + 142
= 257
(b)
Number of stickers in the end
= 69 + 71
= 140
Answer(s): (a) 257; (b) 140