The ratio of the number of red stickers to green stickers is 8 : 5.
After Adam gives away 40 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 |
8 u |
5 u |
Change |
- 40 |
- 10 |
After |
8 u - 40 |
5 u - 10 |
The number of red stickers and green stickers in the end is the same.
8 u - 40 = 5 u - 10
8 u - 5 u = 40 - 10
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stickers that Adam has now
= 8 u - 40 + 5 u - 10
= 8 u + 5 u - 40 - 10
= 13 u - 50
= 13 x 10 - 50
= 130 - 50
= 80
Answer(s): 80