Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 72.
The number of red stickers is decreased by 50% to 92.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 20% |
- 50% |
After |
120% = 72 |
50% = 92 |
(a)
100% - 20% = 120%
120% of blue stickers = 72
100% of blue stickers =
72120 x 100 = 60
100% - 50% = 50%
50% of red stickers = 92
100% of red stickers =
9250 x 100 = 184
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 60 + 184
= 244
(b)
Number of stickers in the end
= 72 + 92
= 164
Answer(s): (a) 244; (b) 164