Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 25% to 87.
The number of red stickers is decreased by 30% to 56.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
- 25% |
- 30% |
After |
75% = 87 |
70% = 56 |
(a)
100% - 25% = 75%
75% of green stickers = 87
100% of green stickers =
8775 x 100 = 116
100% - 30% = 70%
70% of red stickers = 56
100% of red stickers =
5670 x 100 = 80
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 116 + 80
= 196
(b)
Number of stickers in the end
= 87 + 56
= 143
Answer(s): (a) 196; (b) 143