Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 30% to 91.
The number of red stickers is decreased by 50% to 81.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
- 30% |
- 50% |
After |
70% = 91 |
50% = 81 |
(a)
100% - 30% = 70%
70% of red stickers = 91
100% of red stickers =
9170 x 100 = 130
100% - 50% = 50%
50% of blue stickers = 81
100% of blue stickers =
8150 x 100 = 162
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 130 + 162
= 292
(b)
Number of stickers in the end
= 91 + 81
= 172
Answer(s): (a) 292; (b) 172