Adam has some red stickers and green stickers.
The number of red stickers is increased by 25% to 90.
The number of green stickers is increased by 10% to 99.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 25% |
+ 10% |
After |
125% = 90 |
110% = 99 |
(a)
100% + 25% = 125%
125% of red stickers = 90
100% of red stickers =
90125 x 100 = 72
100% + 10% = 110%
110% of green stickers = 99
100% of green stickers =
99110 x 100 = 90
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 72 + 90
= 162
(b)
Number of stickers in the end
= 90 + 99
= 189
Answer(s): (a) 162; (b) 189