Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 40% to 98.
The number of red stickers is decreased by 20% to 80.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Green |
Before |
100% |
100% |
Change |
+ 40% |
- 20% |
After |
140% = 98 |
80% = 80 |
(a)
100% - 40% = 140%
140% of blue stickers = 98
100% of blue stickers =
98140 x 100 = 70
100% - 20% = 80%
80% of green stickers = 80
100% of green stickers =
8080 x 100 = 100
Number of stickers at first
= 100% of blue stickers + 100% of green stickers
= 70 + 100
= 170
(b)
Number of stickers in the end
= 98 + 80
= 178
Answer(s): (a) 170; (b) 178