Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 10% to 66.
The number of red stickers is decreased by 50% to 79.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 10% |
- 50% |
After |
110% = 66 |
50% = 79 |
(a)
100% - 10% = 110%
110% of green stickers = 66
100% of green stickers =
66110 x 100 = 60
100% - 50% = 50%
50% of blue stickers = 79
100% of blue stickers =
7950 x 100 = 158
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 60 + 158
= 218
(b)
Number of stickers in the end
= 66 + 79
= 145
Answer(s): (a) 218; (b) 145