Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 54.
The number of red stickers is decreased by 30% to 56.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Green |
Before |
100% |
100% |
Change |
+ 20% |
- 30% |
After |
120% = 54 |
70% = 56 |
(a)
100% - 20% = 120%
120% of blue stickers = 54
100% of blue stickers =
54120 x 100 = 45
100% - 30% = 70%
70% of green stickers = 56
100% of green stickers =
5670 x 100 = 80
Number of stickers at first
= 100% of blue stickers + 100% of green stickers
= 45 + 80
= 125
(b)
Number of stickers in the end
= 54 + 56
= 110
Answer(s): (a) 125; (b) 110