Adam has some green stickers and red stickers.
The number of green stickers is increased by 30% to 65.
The number of red stickers is increased by 20% to 84.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 30% |
+ 20% |
After |
130% = 65 |
120% = 84 |
(a)
100% + 30% = 130%
130% of green stickers = 65
100% of green stickers =
65130 x 100 = 50
100% + 20% = 120%
120% of red stickers = 84
100% of red stickers =
84120 x 100 = 70
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 50 + 70
= 120
(b)
Number of stickers in the end
= 65 + 84
= 149
Answer(s): (a) 120; (b) 149