Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 81.
The number of red stickers is decreased by 50% to 67.
- 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% = 81 |
50% = 67 |
(a)
100% - 40% = 60%
60% of green stickers = 81
100% of green stickers =
8160 x 100 = 135
100% - 50% = 50%
50% of red stickers = 67
100% of red stickers =
6750 x 100 = 134
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 135 + 134
= 269
(b)
Number of stickers in the end
= 81 + 67
= 148
Answer(s): (a) 269; (b) 148