The ratio of the number of red stickers to green stickers is 9 : 7.
After Adam gives away 80 red stickers and 50 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 |
7 u |
Change |
- 80 |
- 50 |
After |
9 u - 80 |
7 u - 50 |
The number of red stickers and green stickers in the end is the same.
9 u - 80 = 7 u - 50
9 u - 7 u = 80 - 50
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 9 u - 80 + 7 u - 50
= 9 u + 7 u - 80 - 50
= 16 u - 130
= 16 x 15 - 130
= 240 - 130
= 110
Answer(s): 110