Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 20% to 92.
The number of red stickers is decreased by 50% to 70.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
- 20% |
- 50% |
After |
80% = 92 |
50% = 70 |
(a)
100% - 20% = 80%
80% of red stickers = 92
100% of red stickers =
9280 x 100 = 115
100% - 50% = 50%
50% of blue stickers = 70
100% of blue stickers =
7050 x 100 = 140
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 115 + 140
= 255
(b)
Number of stickers in the end
= 92 + 70
= 162
Answer(s): (a) 255; (b) 162