The ratio of the number of red stickers to blue stickers is 9 : 7.
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 |
9 u |
7 u |
Change |
- 60 |
- 10 |
After |
9 u - 60 |
7 u - 10 |
The number of red stickers and blue stickers in the end is the same.
9 u - 60 = 7 u - 10
9 u - 7 u = 60 - 10
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 9 u - 60 + 7 u - 10
= 9 u + 7 u - 60 - 10
= 16 u - 70
= 16 x 25 - 70
= 400 - 70
= 330
Answer(s): 330