Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 20% to 60.
The number of red stickers is decreased by 30% to 63.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 20% |
- 30% |
After |
80% = 60 |
70% = 63 |
(a)
100% - 20% = 80%
80% of blue stickers = 60
100% of blue stickers =
6080 x 100 = 75
100% - 30% = 70%
70% of red stickers = 63
100% of red stickers =
6370 x 100 = 90
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 75 + 90
= 165
(b)
Number of stickers in the end
= 60 + 63
= 123
Answer(s): (a) 165; (b) 123