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 79.
- 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% = 79 |
(a)
100% - 40% = 60%
60% of green stickers = 81
100% of green stickers =
8160 x 100 = 135
100% - 50% = 50%
50% of red stickers = 79
100% of red stickers =
7950 x 100 = 158
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 135 + 158
= 293
(b)
Number of stickers in the end
= 81 + 79
= 160
Answer(s): (a) 293; (b) 160