Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 30% to 84.
The number of red stickers is decreased by 40% to 69.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
- 30% |
- 40% |
After |
70% = 84 |
60% = 69 |
(a)
100% - 30% = 70%
70% of red stickers = 84
100% of red stickers =
8470 x 100 = 120
100% - 40% = 60%
60% of green stickers = 69
100% of green stickers =
6960 x 100 = 115
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 120 + 115
= 235
(b)
Number of stickers in the end
= 84 + 69
= 153
Answer(s): (a) 235; (b) 153