The ratio of the number of red stickers to green stickers is 9 : 5.
After Adam gives away 80 red stickers and 40 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
9 u |
5 u |
Change |
- 80 |
- 40 |
After |
9 u - 80 |
5 u - 40 |
The number of red stickers and green stickers in the end is the same.
9 u - 80 = 5 u - 40
9 u - 5 u = 80 - 40
4 u = 40
1 u = 40 ÷ 4 = 10
Number of stickers that Adam has now
= 9 u - 80 + 5 u - 40
= 9 u + 5 u - 80 - 40
= 14 u - 120
= 14 x 10 - 120
= 140 - 120
= 20
Answer(s): 20