Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 60.
The number of red stickers is decreased by 50% to 67.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 20% |
- 50% |
After |
120% = 60 |
50% = 67 |
(a)
100% - 20% = 120%
120% of red stickers = 60
100% of red stickers =
60120 x 100 = 50
100% - 50% = 50%
50% of green stickers = 67
100% of green stickers =
6750 x 100 = 134
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 50 + 134
= 184
(b)
Number of stickers in the end
= 60 + 67
= 127
Answer(s): (a) 184; (b) 127