Adam has some red stickers and green stickers.
The number of red stickers is increased by 5% to 63.
The number of green stickers is increased by 30% to 78.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 5% |
+ 30% |
After |
105% = 63 |
130% = 78 |
(a)
100% + 5% = 105%
105% of red stickers = 63
100% of red stickers =
63105 x 100 = 60
100% + 30% = 130%
130% of green stickers = 78
100% of green stickers =
78130 x 100 = 60
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 60 + 60
= 120
(b)
Number of stickers in the end
= 63 + 78
= 141
Answer(s): (a) 120; (b) 141