Adam has some green stickers and blue stickers.
The number of green stickers is increased by 10% to 77.
The number of blue stickers is increased by 50% to 90.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 10% |
+ 50% |
After |
110% = 77 |
150% = 90 |
(a)
100% + 10% = 110%
110% of green stickers = 77
100% of green stickers =
77110 x 100 = 70
100% + 50% = 150%
150% of blue stickers = 90
100% of blue stickers =
90150 x 100 = 60
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 70 + 60
= 130
(b)
Number of stickers in the end
= 77 + 90
= 167
Answer(s): (a) 130; (b) 167