Adam has some green stickers and blue stickers.
The number of green stickers is increased by 10% to 99.
The number of blue stickers is increased by 30% to 78.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Blue |
Before |
100% |
100% |
Change |
+ 10% |
+ 30% |
After |
110% = 99 |
130% = 78 |
(a)
100% + 10% = 110%
110% of green stickers = 99
100% of green stickers =
99110 x 100 = 90
100% + 30% = 130%
130% of blue stickers = 78
100% of blue stickers =
78130 x 100 = 60
Number of stickers at first
= 100% of green stickers + 100% of blue stickers
= 90 + 60
= 150
(b)
Number of stickers in the end
= 99 + 78
= 177
Answer(s): (a) 150; (b) 177