Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 90.
The number of red stickers is decreased by 30% to 56.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 25% |
- 30% |
After |
125% = 90 |
70% = 56 |
(a)
100% - 25% = 125%
125% of green stickers = 90
100% of green stickers =
90125 x 100 = 72
100% - 30% = 70%
70% of blue stickers = 56
100% of blue stickers =
5670 x 100 = 80
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 72 + 80
= 152
(b)
Number of stickers in the end
= 90 + 56
= 146
Answer(s): (a) 152; (b) 146