The ratio of the number of red stickers to green stickers is 9 : 7.
After Adam gives away 90 red stickers and 30 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 |
- 90 |
- 30 |
After |
9 u - 90 |
7 u - 30 |
The number of red stickers and green stickers in the end is the same.
9 u - 90 = 7 u - 30
9 u - 7 u = 90 - 30
2 u = 60
1 u = 60 ÷ 2 = 30
Number of stickers that Adam has now
= 9 u - 90 + 7 u - 30
= 9 u + 7 u - 90 - 30
= 16 u - 120
= 16 x 30 - 120
= 480 - 120
= 360
Answer(s): 360