Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 30% to 70.
The number of red stickers is decreased by 40% to 87.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
- 30% |
- 40% |
After |
70% = 70 |
60% = 87 |
(a)
100% - 30% = 70%
70% of red stickers = 70
100% of red stickers =
7070 x 100 = 100
100% - 40% = 60%
60% of green stickers = 87
100% of green stickers =
8760 x 100 = 145
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 100 + 145
= 245
(b)
Number of stickers in the end
= 70 + 87
= 157
Answer(s): (a) 245; (b) 157