Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 30% to 65.
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?
|
Blue |
Green |
Before |
100% |
100% |
Change |
+ 30% |
- 10% |
After |
130% = 65 |
90% = 99 |
(a)
100% - 30% = 130%
130% of blue stickers = 65
100% of blue stickers =
65130 x 100 = 50
100% - 10% = 90%
90% of green stickers = 99
100% of green stickers =
9990 x 100 = 110
Number of stickers at first
= 100% of blue stickers + 100% of green stickers
= 50 + 110
= 160
(b)
Number of stickers in the end
= 65 + 99
= 164
Answer(s): (a) 160; (b) 164