The ratio of the number of green stickers to blue stickers is 7 : 5.
After Adam gives away 60 green stickers and 40 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
7 u |
5 u |
Change |
- 60 |
- 40 |
After |
7 u - 60 |
5 u - 40 |
The number of green stickers and blue stickers in the end is the same.
7 u - 60 = 5 u - 40
7 u - 5 u = 60 - 40
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 7 u - 60 + 5 u - 40
= 7 u + 5 u - 60 - 40
= 12 u - 100
= 12 x 10 - 100
= 120 - 100
= 20
Answer(s): 20