Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 90.
The number of red stickers is decreased by 40% to 93.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 25% |
- 40% |
After |
125% = 90 |
60% = 93 |
(a)
100% - 25% = 125%
125% of red stickers = 90
100% of red stickers =
90125 x 100 = 72
100% - 40% = 60%
60% of green stickers = 93
100% of green stickers =
9360 x 100 = 155
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 72 + 155
= 227
(b)
Number of stickers in the end
= 90 + 93
= 183
Answer(s): (a) 227; (b) 183