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 30% to 70.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 25% |
- 30% |
After |
125% = 55 |
70% = 70 |
(a)
100% - 25% = 125%
125% of red stickers = 55
100% of red stickers =
55125 x 100 = 44
100% - 30% = 70%
70% of green stickers = 70
100% of green stickers =
7070 x 100 = 100
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 44 + 100
= 144
(b)
Number of stickers in the end
= 55 + 70
= 125
Answer(s): (a) 144; (b) 125