Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 5% to 57.
The number of red stickers is decreased by 50% to 79.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
- 5% |
- 50% |
After |
95% = 57 |
50% = 79 |
(a)
100% - 5% = 95%
95% of green stickers = 57
100% of green stickers =
5795 x 100 = 60
100% - 50% = 50%
50% of red stickers = 79
100% of red stickers =
7950 x 100 = 158
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 60 + 158
= 218
(b)
Number of stickers in the end
= 57 + 79
= 136
Answer(s): (a) 218; (b) 136