The ratio of the number of green stickers to red stickers is 5 : 3.
After Adam gives away 30 green stickers and 10 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
5 u |
3 u |
Change |
- 30 |
- 10 |
After |
5 u - 30 |
3 u - 10 |
The number of green stickers and red stickers in the end is the same.
5 u - 30 = 3 u - 10
5 u - 3 u = 30 - 10
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 5 u - 30 + 3 u - 10
= 5 u + 3 u - 30 - 10
= 8 u - 40
= 8 x 10 - 40
= 80 - 40
= 40
Answer(s): 40