Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 55.
The number of red stickers is decreased by 10% to 90.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 25% |
- 10% |
After |
125% = 55 |
90% = 90 |
(a)
100% - 25% = 125%
125% of blue stickers = 55
100% of blue stickers =
55125 x 100 = 44
100% - 10% = 90%
90% of red stickers = 90
100% of red stickers =
9090 x 100 = 100
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 44 + 100
= 144
(b)
Number of stickers in the end
= 55 + 90
= 145
Answer(s): (a) 144; (b) 145