Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 72.
The number of red stickers is decreased by 50% to 70.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Green |
Before |
100% |
100% |
Change |
- 40% |
- 50% |
After |
60% = 72 |
50% = 70 |
(a)
100% - 40% = 60%
60% of blue stickers = 72
100% of blue stickers =
7260 x 100 = 120
100% - 50% = 50%
50% of green stickers = 70
100% of green stickers =
7050 x 100 = 140
Number of stickers at first
= 100% of blue stickers + 100% of green stickers
= 120 + 140
= 260
(b)
Number of stickers in the end
= 72 + 70
= 142
Answer(s): (a) 260; (b) 142