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 50% to 89.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 25% |
- 50% |
After |
125% = 70 |
50% = 89 |
(a)
100% - 25% = 125%
125% of green stickers = 70
100% of green stickers =
70125 x 100 = 56
100% - 50% = 50%
50% of red stickers = 89
100% of red stickers =
8950 x 100 = 178
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 56 + 178
= 234
(b)
Number of stickers in the end
= 70 + 89
= 159
Answer(s): (a) 234; (b) 159