Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 87.
The number of red stickers is decreased by 50% to 51.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
- 40% |
- 50% |
After |
60% = 87 |
50% = 51 |
(a)
100% - 40% = 60%
60% of red stickers = 87
100% of red stickers =
8760 x 100 = 145
100% - 50% = 50%
50% of blue stickers = 51
100% of blue stickers =
5150 x 100 = 102
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 145 + 102
= 247
(b)
Number of stickers in the end
= 87 + 51
= 138
Answer(s): (a) 247; (b) 138