Adam has some red stickers and green stickers.
The number of red stickers is increased by 20% to 60.
The number of green stickers is increased by 10% to 66.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 20% |
+ 10% |
After |
120% = 60 |
110% = 66 |
(a)
100% + 20% = 120%
120% of red stickers = 60
100% of red stickers =
60120 x 100 = 50
100% + 10% = 110%
110% of green stickers = 66
100% of green stickers =
66110 x 100 = 60
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 50 + 60
= 110
(b)
Number of stickers in the end
= 60 + 66
= 126
Answer(s): (a) 110; (b) 126