Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 25% to 75.
The number of red stickers is increased by 20% to 78.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 25% |
+ 20% |
After |
125% = 75 |
120% = 78 |
(a)
100% + 25% = 125%
125% of blue stickers = 75
100% of blue stickers =
75125 x 100 = 60
100% + 20% = 120%
120% of red stickers = 78
100% of red stickers =
78120 x 100 = 65
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 60 + 65
= 125
(b)
Number of stickers in the end
= 75 + 78
= 153
Answer(s): (a) 125; (b) 153