The ratio of the number of green stickers to red stickers is 9 : 7.
After Adam gives away 60 green stickers and 40 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 |
- 40 |
After |
9 u - 60 |
7 u - 40 |
The number of green stickers and red stickers in the end is the same.
9 u - 60 = 7 u - 40
9 u - 7 u = 60 - 40
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 9 u - 60 + 7 u - 40
= 9 u + 7 u - 60 - 40
= 16 u - 100
= 16 x 10 - 100
= 160 - 100
= 60
Answer(s): 60