Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 5% to 84.
The number of red stickers is decreased by 20% to 56.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Green |
Before |
100% |
100% |
Change |
+ 5% |
- 20% |
After |
105% = 84 |
80% = 56 |
(a)
100% - 5% = 105%
105% of blue stickers = 84
100% of blue stickers =
84105 x 100 = 80
100% - 20% = 80%
80% of green stickers = 56
100% of green stickers =
5680 x 100 = 70
Number of stickers at first
= 100% of blue stickers + 100% of green stickers
= 80 + 70
= 150
(b)
Number of stickers in the end
= 84 + 56
= 140
Answer(s): (a) 150; (b) 140