Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 25% to 72.
The number of red stickers is decreased by 20% to 92.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 25% |
- 20% |
After |
75% = 72 |
80% = 92 |
(a)
100% - 25% = 75%
75% of blue stickers = 72
100% of blue stickers =
7275 x 100 = 96
100% - 20% = 80%
80% of red stickers = 92
100% of red stickers =
9280 x 100 = 115
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 96 + 115
= 211
(b)
Number of stickers in the end
= 72 + 92
= 164
Answer(s): (a) 211; (b) 164