The ratio of the number of red stickers to green stickers is 9 : 4.
After Adam gives away 70 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 |
9 u |
4 u |
Change |
- 70 |
- 30 |
After |
9 u - 70 |
4 u - 30 |
The number of red stickers and green stickers in the end is the same.
9 u - 70 = 4 u - 30
9 u - 4 u = 70 - 30
5 u = 40
1 u = 40 ÷ 5 = 8
Number of stickers that Adam has now
= 9 u - 70 + 4 u - 30
= 9 u + 4 u - 70 - 30
= 13 u - 100
= 13 x 8 - 100
= 104 - 100
= 4
Answer(s): 4