Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 30% to 56.
The number of red stickers is decreased by 20% to 76.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
- 30% |
- 20% |
After |
70% = 56 |
80% = 76 |
(a)
100% - 30% = 70%
70% of green stickers = 56
100% of green stickers =
5670 x 100 = 80
100% - 20% = 80%
80% of red stickers = 76
100% of red stickers =
7680 x 100 = 95
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 80 + 95
= 175
(b)
Number of stickers in the end
= 56 + 76
= 132
Answer(s): (a) 175; (b) 132