The ratio of the number of red stickers to blue stickers is 7 : 5.
After Adam buys 40 red stickers and 60 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 |
+ 40 |
+ 60 |
After |
7 u + 40 |
5 u + 60 |
The number of red stickers and blue stickers are equal in the end.
7 u + 40 = 5 u + 60
7 u - 5 u = 60 - 40
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 7 u + 40 + 5 u + 60
= 7 u + 5 u + 40 + 60
= 12 u + 100
= 12 x 10 + 100
= 120 + 100
= 220
Answer(s): 220