Adam has some green stickers and red stickers.
The number of green stickers is increased by 30% to 78.
The number of red stickers is increased by 50% to 63.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 30% |
+ 50% |
After |
130% = 78 |
150% = 63 |
(a)
100% + 30% = 130%
130% of green stickers = 78
100% of green stickers =
78130 x 100 = 60
100% + 50% = 150%
150% of red stickers = 63
100% of red stickers =
63150 x 100 = 42
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 60 + 42
= 102
(b)
Number of stickers in the end
= 78 + 63
= 141
Answer(s): (a) 102; (b) 141