Adam has some red stickers and green stickers.
The number of red stickers is increased by 25% to 50.
The number of green stickers is increased by 20% to 60.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 25% |
+ 20% |
After |
125% = 50 |
120% = 60 |
(a)
100% + 25% = 125%
125% of red stickers = 50
100% of red stickers =
50125 x 100 = 40
100% + 20% = 120%
120% of green stickers = 60
100% of green stickers =
60120 x 100 = 50
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 40 + 50
= 90
(b)
Number of stickers in the end
= 50 + 60
= 110
Answer(s): (a) 90; (b) 110