The ratio of the number of blue stickers to green stickers is 9 : 7.
After Adam gives away 80 blue stickers and 60 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
9 u |
7 u |
Change |
- 80 |
- 60 |
After |
9 u - 80 |
7 u - 60 |
The number of blue stickers and green stickers in the end is the same.
9 u - 80 = 7 u - 60
9 u - 7 u = 80 - 60
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 9 u - 80 + 7 u - 60
= 9 u + 7 u - 80 - 60
= 16 u - 140
= 16 x 10 - 140
= 160 - 140
= 20
Answer(s): 20