The ratio of the number of red stickers to green stickers is 7 : 5.
After Adam buys 30 red stickers and 50 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 |
+ 30 |
+ 50 |
After |
7 u + 30 |
5 u + 50 |
The number of red stickers and green stickers are equal in the end.
7 u + 30 = 5 u + 50
7 u - 5 u = 50 - 30
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 7 u + 30 + 5 u + 50
= 7 u + 5 u + 30 + 50
= 12 u + 80
= 12 x 10 + 80
= 120 + 80
= 200
Answer(s): 200