Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 40% to 90.
The number of red stickers is decreased by 30% to 63.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
- 40% |
- 30% |
After |
60% = 90 |
70% = 63 |
(a)
100% - 40% = 60%
60% of green stickers = 90
100% of green stickers =
9060 x 100 = 150
100% - 30% = 70%
70% of blue stickers = 63
100% of blue stickers =
6370 x 100 = 90
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 150 + 90
= 240
(b)
Number of stickers in the end
= 90 + 63
= 153
Answer(s): (a) 240; (b) 153