Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 78.
The number of red stickers is decreased by 50% to 85.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 20% |
- 50% |
After |
120% = 78 |
50% = 85 |
(a)
100% - 20% = 120%
120% of green stickers = 78
100% of green stickers =
78120 x 100 = 65
100% - 50% = 50%
50% of blue stickers = 85
100% of blue stickers =
8550 x 100 = 170
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 65 + 170
= 235
(b)
Number of stickers in the end
= 78 + 85
= 163
Answer(s): (a) 235; (b) 163