Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 96.
The number of red stickers is decreased by 30% to 70.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 20% |
- 30% |
After |
120% = 96 |
70% = 70 |
(a)
100% - 20% = 120%
120% of red stickers = 96
100% of red stickers =
96120 x 100 = 80
100% - 30% = 70%
70% of blue stickers = 70
100% of blue stickers =
7070 x 100 = 100
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 80 + 100
= 180
(b)
Number of stickers in the end
= 96 + 70
= 166
Answer(s): (a) 180; (b) 166