The ratio of the number of red stickers to blue stickers is 7 : 5.
After Adam gives away 60 red stickers and 10 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
7 u |
5 u |
Change |
- 60 |
- 10 |
After |
7 u - 60 |
5 u - 10 |
The number of red stickers and blue stickers in the end is the same.
7 u - 60 = 5 u - 10
7 u - 5 u = 60 - 10
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 7 u - 60 + 5 u - 10
= 7 u + 5 u - 60 - 10
= 12 u - 70
= 12 x 25 - 70
= 300 - 70
= 230
Answer(s): 230