Adam has some red stickers and green stickers.
The number of red stickers is increased by 30% to 91.
The number of green stickers is increased by 50% to 66.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 30% |
+ 50% |
After |
130% = 91 |
150% = 66 |
(a)
100% + 30% = 130%
130% of red stickers = 91
100% of red stickers =
91130 x 100 = 70
100% + 50% = 150%
150% of green stickers = 66
100% of green stickers =
66150 x 100 = 44
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 70 + 44
= 114
(b)
Number of stickers in the end
= 91 + 66
= 157
Answer(s): (a) 114; (b) 157