Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 65.
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?
|
Blue |
Green |
Before |
100% |
100% |
Change |
+ 25% |
- 30% |
After |
125% = 65 |
70% = 63 |
(a)
100% - 25% = 125%
125% of blue stickers = 65
100% of blue stickers =
65125 x 100 = 52
100% - 30% = 70%
70% of green stickers = 63
100% of green stickers =
6370 x 100 = 90
Number of stickers at first
= 100% of blue stickers + 100% of green stickers
= 52 + 90
= 142
(b)
Number of stickers in the end
= 65 + 63
= 128
Answer(s): (a) 142; (b) 128