The ratio of the number of red stickers to green stickers is 7 : 4.
After Adam gives away 50 red stickers and 20 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
7 u |
4 u |
Change |
- 50 |
- 20 |
After |
7 u - 50 |
4 u - 20 |
The number of red stickers and green stickers in the end is the same.
7 u - 50 = 4 u - 20
7 u - 4 u = 50 - 20
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stickers that Adam has now
= 7 u - 50 + 4 u - 20
= 7 u + 4 u - 50 - 20
= 11 u - 70
= 11 x 10 - 70
= 110 - 70
= 40
Answer(s): 40