Adam has some red stickers and blue stickers.
The number of red stickers is increased by 25% to 65.
The number of blue stickers is increased by 30% to 78.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 25% |
+ 30% |
After |
125% = 65 |
130% = 78 |
(a)
100% + 25% = 125%
125% of red stickers = 65
100% of red stickers =
65125 x 100 = 52
100% + 30% = 130%
130% of blue stickers = 78
100% of blue stickers =
78130 x 100 = 60
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 52 + 60
= 112
(b)
Number of stickers in the end
= 65 + 78
= 143
Answer(s): (a) 112; (b) 143