Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 40% to 70.
The number of red stickers is decreased by 20% to 52.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 40% |
- 20% |
After |
140% = 70 |
80% = 52 |
(a)
100% - 40% = 140%
140% of red stickers = 70
100% of red stickers =
70140 x 100 = 50
100% - 20% = 80%
80% of green stickers = 52
100% of green stickers =
5280 x 100 = 65
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 50 + 65
= 115
(b)
Number of stickers in the end
= 70 + 52
= 122
Answer(s): (a) 115; (b) 122