Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 30% to 78.
The number of red stickers is decreased by 50% to 78.
- 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% = 78 |
50% = 78 |
(a)
100% - 30% = 130%
130% of blue stickers = 78
100% of blue stickers =
78130 x 100 = 60
100% - 50% = 50%
50% of red stickers = 78
100% of red stickers =
7850 x 100 = 156
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 60 + 156
= 216
(b)
Number of stickers in the end
= 78 + 78
= 156
Answer(s): (a) 216; (b) 156