Adam has some red stickers and blue stickers.
The number of red stickers is increased by 20% to 78.
The number of blue stickers is increased by 50% to 72.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Blue |
Before |
100% |
100% |
Change |
+ 20% |
+ 50% |
After |
120% = 78 |
150% = 72 |
(a)
100% + 20% = 120%
120% of red stickers = 78
100% of red stickers =
78120 x 100 = 65
100% + 50% = 150%
150% of blue stickers = 72
100% of blue stickers =
72150 x 100 = 48
Number of stickers at first
= 100% of red stickers + 100% of blue stickers
= 65 + 48
= 113
(b)
Number of stickers in the end
= 78 + 72
= 150
Answer(s): (a) 113; (b) 150