The ratio of the number of red stickers to blue stickers is 5 : 3.
After Adam buys 60 red stickers and 80 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
5 u |
3 u |
Change |
+ 60 |
+ 80 |
After |
5 u + 60 |
3 u + 80 |
The number of red stickers and blue stickers are equal in the end.
5 u + 60 = 3 u + 80
5 u - 3 u = 80 - 60
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 5 u + 60 + 3 u + 80
= 5 u + 3 u + 60 + 80
= 8 u + 140
= 8 x 10 + 140
= 80 + 140
= 220
Answer(s): 220