The ratio of the number of red stickers to green stickers is 7 : 5.
After Adam buys 60 red stickers and 70 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 |
5 u |
Change |
+ 60 |
+ 70 |
After |
7 u + 60 |
5 u + 70 |
The number of red stickers and green stickers are equal in the end.
7 u + 60 = 5 u + 70
7 u - 5 u = 70 - 60
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 7 u + 60 + 5 u + 70
= 7 u + 5 u + 60 + 70
= 12 u + 130
= 12 x 5 + 130
= 60 + 130
= 190
Answer(s): 190