Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 10% to 77.
The number of red stickers is decreased by 50% to 84.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 10% |
- 50% |
After |
110% = 77 |
50% = 84 |
(a)
100% - 10% = 110%
110% of red stickers = 77
100% of red stickers =
77110 x 100 = 70
100% - 50% = 50%
50% of blue stickers = 84
100% of blue stickers =
8450 x 100 = 168
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 70 + 168
= 238
(b)
Number of stickers in the end
= 77 + 84
= 161
Answer(s): (a) 238; (b) 161