Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 20% to 56.
The number of red stickers is decreased by 30% to 70.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
- 20% |
- 30% |
After |
80% = 56 |
70% = 70 |
(a)
100% - 20% = 80%
80% of green stickers = 56
100% of green stickers =
5680 x 100 = 70
100% - 30% = 70%
70% of blue stickers = 70
100% of blue stickers =
7070 x 100 = 100
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 70 + 100
= 170
(b)
Number of stickers in the end
= 56 + 70
= 126
Answer(s): (a) 170; (b) 126