Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 90.
The number of red stickers is increased by 50% to 84.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 20% |
+ 50% |
After |
120% = 90 |
150% = 84 |
(a)
100% + 20% = 120%
120% of blue stickers = 90
100% of blue stickers =
90120 x 100 = 75
100% + 50% = 150%
150% of red stickers = 84
100% of red stickers =
84150 x 100 = 56
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 75 + 56
= 131
(b)
Number of stickers in the end
= 90 + 84
= 174
Answer(s): (a) 131; (b) 174