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 93.
- 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% = 93 |
(a)
100% + 20% = 120%
120% of blue stickers = 90
100% of blue stickers =
90120 x 100 = 75
100% + 50% = 150%
150% of red stickers = 93
100% of red stickers =
93150 x 100 = 62
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 75 + 62
= 137
(b)
Number of stickers in the end
= 90 + 93
= 183
Answer(s): (a) 137; (b) 183