Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 30% to 65.
The number of red stickers is decreased by 50% to 77.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 30% |
- 50% |
After |
130% = 65 |
50% = 77 |
(a)
100% - 30% = 130%
130% of blue stickers = 65
100% of blue stickers =
65130 x 100 = 50
100% - 50% = 50%
50% of red stickers = 77
100% of red stickers =
7750 x 100 = 154
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 50 + 154
= 204
(b)
Number of stickers in the end
= 65 + 77
= 142
Answer(s): (a) 204; (b) 142