Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 30% to 77.
The number of red stickers is decreased by 50% to 52.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 30% |
- 50% |
After |
70% = 77 |
50% = 52 |
(a)
100% - 30% = 70%
70% of blue stickers = 77
100% of blue stickers =
7770 x 100 = 110
100% - 50% = 50%
50% of red stickers = 52
100% of red stickers =
5250 x 100 = 104
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 110 + 104
= 214
(b)
Number of stickers in the end
= 77 + 52
= 129
Answer(s): (a) 214; (b) 129