Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 10% to 90.
The number of red stickers is decreased by 50% to 76.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
- 10% |
- 50% |
After |
90% = 90 |
50% = 76 |
(a)
100% - 10% = 90%
90% of green stickers = 90
100% of green stickers =
9090 x 100 = 100
100% - 50% = 50%
50% of blue stickers = 76
100% of blue stickers =
7650 x 100 = 152
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 100 + 152
= 252
(b)
Number of stickers in the end
= 90 + 76
= 166
Answer(s): (a) 252; (b) 166