Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 70.
The number of red stickers is decreased by 40% to 66.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 25% |
- 40% |
After |
125% = 70 |
60% = 66 |
(a)
100% - 25% = 125%
125% of green stickers = 70
100% of green stickers =
70125 x 100 = 56
100% - 40% = 60%
60% of red stickers = 66
100% of red stickers =
6660 x 100 = 110
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 56 + 110
= 166
(b)
Number of stickers in the end
= 70 + 66
= 136
Answer(s): (a) 166; (b) 136