Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 78.
The number of red stickers is decreased by 30% to 84.
- 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% = 78 |
70% = 84 |
(a)
100% - 40% = 60%
60% of green stickers = 78
100% of green stickers =
7860 x 100 = 130
100% - 30% = 70%
70% of blue stickers = 84
100% of blue stickers =
8470 x 100 = 120
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 130 + 120
= 250
(b)
Number of stickers in the end
= 78 + 84
= 162
Answer(s): (a) 250; (b) 162