Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 30% to 63.
The number of red stickers is decreased by 10% to 99.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
- 30% |
- 10% |
After |
70% = 63 |
90% = 99 |
(a)
100% - 30% = 70%
70% of red stickers = 63
100% of red stickers =
6370 x 100 = 90
100% - 10% = 90%
90% of blue stickers = 99
100% of blue stickers =
9990 x 100 = 110
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 90 + 110
= 200
(b)
Number of stickers in the end
= 63 + 99
= 162
Answer(s): (a) 200; (b) 162