Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 25% to 75.
The number of red stickers is decreased by 50% to 68.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
- 25% |
- 50% |
After |
75% = 75 |
50% = 68 |
(a)
100% - 25% = 75%
75% of blue stickers = 75
100% of blue stickers =
7575 x 100 = 100
100% - 50% = 50%
50% of red stickers = 68
100% of red stickers =
6850 x 100 = 136
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 100 + 136
= 236
(b)
Number of stickers in the end
= 75 + 68
= 143
Answer(s): (a) 236; (b) 143