The ratio of the number of green stickers to red stickers is 9 : 7.
After Adam gives away 60 green stickers and 20 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
9 u |
7 u |
Change |
- 60 |
- 20 |
After |
9 u - 60 |
7 u - 20 |
The number of green stickers and red stickers in the end is the same.
9 u - 60 = 7 u - 20
9 u - 7 u = 60 - 20
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has now
= 9 u - 60 + 7 u - 20
= 9 u + 7 u - 60 - 20
= 16 u - 80
= 16 x 20 - 80
= 320 - 80
= 240
Answer(s): 240