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 30% to 91.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 25% |
- 30% |
After |
75% = 72 |
70% = 91 |
(a)
100% - 25% = 75%
75% of blue stickers = 72
100% of blue stickers =
7275 x 100 = 96
100% - 30% = 70%
70% of red stickers = 91
100% of red stickers =
9170 x 100 = 130
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 96 + 130
= 226
(b)
Number of stickers in the end
= 72 + 91
= 163
Answer(s): (a) 226; (b) 163