The ratio of the number of green stickers to red stickers is 5 : 3.
After Adam gives away 90 green stickers and 40 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 |
- 90 |
- 40 |
After |
5 u - 90 |
3 u - 40 |
The number of green stickers and red stickers in the end is the same.
5 u - 90 = 3 u - 40
5 u - 3 u = 90 - 40
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 5 u - 90 + 3 u - 40
= 5 u + 3 u - 90 - 40
= 8 u - 130
= 8 x 25 - 130
= 200 - 130
= 70
Answer(s): 70