The ratio of the number of red stickers to green stickers is 8 : 3.
After Adam gives away 90 red stickers and 30 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 |
3 u |
Change |
- 90 |
- 30 |
After |
8 u - 90 |
3 u - 30 |
The number of red stickers and green stickers in the end is the same.
8 u - 90 = 3 u - 30
8 u - 3 u = 90 - 30
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has now
= 8 u - 90 + 3 u - 30
= 8 u + 3 u - 90 - 30
= 11 u - 120
= 11 x 12 - 120
= 132 - 120
= 12
Answer(s): 12