The ratio of the number of red stickers to green stickers is 3 : 1.
After Adam gives away 60 red stickers and 10 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
3 u |
1 u |
Change |
- 60 |
- 10 |
After |
3 u - 60 |
1 u - 10 |
The number of red stickers and green stickers in the end is the same.
3 u - 60 = 1 u - 10
3 u - 1 u = 60 - 10
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 3 u - 60 + 1 u - 10
= 3 u + 1 u - 60 - 10
= 4 u - 70
= 4 x 25 - 70
= 100 - 70
= 30
Answer(s): 30