Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 51.
The number of red stickers is decreased by 30% to 56.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
- 40% |
- 30% |
After |
60% = 51 |
70% = 56 |
(a)
100% - 40% = 60%
60% of green stickers = 51
100% of green stickers =
5160 x 100 = 85
100% - 30% = 70%
70% of blue stickers = 56
100% of blue stickers =
5670 x 100 = 80
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 85 + 80
= 165
(b)
Number of stickers in the end
= 51 + 56
= 107
Answer(s): (a) 165; (b) 107