Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 25% to 81.
The number of red stickers is decreased by 50% to 91.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
- 25% |
- 50% |
After |
75% = 81 |
50% = 91 |
(a)
100% - 25% = 75%
75% of red stickers = 81
100% of red stickers =
8175 x 100 = 108
100% - 50% = 50%
50% of green stickers = 91
100% of green stickers =
9150 x 100 = 182
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 108 + 182
= 290
(b)
Number of stickers in the end
= 81 + 91
= 172
Answer(s): (a) 290; (b) 172