Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 30% to 52.
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?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 30% |
- 50% |
After |
130% = 52 |
50% = 79 |
(a)
100% - 30% = 130%
130% of red stickers = 52
100% of red stickers =
52130 x 100 = 40
100% - 50% = 50%
50% of green stickers = 79
100% of green stickers =
7950 x 100 = 158
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 40 + 158
= 198
(b)
Number of stickers in the end
= 52 + 79
= 131
Answer(s): (a) 198; (b) 131