Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 20% to 72.
The number of red stickers is decreased by 50% to 78.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
- 20% |
- 50% |
After |
80% = 72 |
50% = 78 |
(a)
100% - 20% = 80%
80% of green stickers = 72
100% of green stickers =
7280 x 100 = 90
100% - 50% = 50%
50% of red stickers = 78
100% of red stickers =
7850 x 100 = 156
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 90 + 156
= 246
(b)
Number of stickers in the end
= 72 + 78
= 150
Answer(s): (a) 246; (b) 150