Adam has some green stickers and red stickers.
The number of green stickers is increased by 20% to 90.
The number of red stickers is increased by 40% to 56.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 20% |
+ 40% |
After |
120% = 90 |
140% = 56 |
(a)
100% + 20% = 120%
120% of green stickers = 90
100% of green stickers =
90120 x 100 = 75
100% + 40% = 140%
140% of red stickers = 56
100% of red stickers =
56140 x 100 = 40
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 75 + 40
= 115
(b)
Number of stickers in the end
= 90 + 56
= 146
Answer(s): (a) 115; (b) 146