Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 60.
The number of red stickers is decreased by 40% to 57.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 20% |
- 40% |
After |
120% = 60 |
60% = 57 |
(a)
100% - 20% = 120%
120% of green stickers = 60
100% of green stickers =
60120 x 100 = 50
100% - 40% = 60%
60% of blue stickers = 57
100% of blue stickers =
5760 x 100 = 95
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 50 + 95
= 145
(b)
Number of stickers in the end
= 60 + 57
= 117
Answer(s): (a) 145; (b) 117