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 30% to 91.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 5% |
- 30% |
After |
105% = 84 |
70% = 91 |
(a)
100% - 5% = 105%
105% of red stickers = 84
100% of red stickers =
84105 x 100 = 80
100% - 30% = 70%
70% of blue stickers = 91
100% of blue stickers =
9170 x 100 = 130
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 80 + 130
= 210
(b)
Number of stickers in the end
= 84 + 91
= 175
Answer(s): (a) 210; (b) 175