The ratio of the number of red stickers to green stickers is 4 : 1.
After Adam gives away 70 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 |
4 u |
1 u |
Change |
- 70 |
- 10 |
After |
4 u - 70 |
1 u - 10 |
The number of red stickers and green stickers in the end is the same.
4 u - 70 = 1 u - 10
4 u - 1 u = 70 - 10
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has now
= 4 u - 70 + 1 u - 10
= 4 u + 1 u - 70 - 10
= 5 u - 80
= 5 x 20 - 80
= 100 - 80
= 20
Answer(s): 20