The ratio of the number of red stickers to green stickers is 9 : 4.
After Adam buys 20 red stickers and 60 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
9 u |
4 u |
Change |
+ 20 |
+ 60 |
After |
9 u + 20 |
4 u + 60 |
The number of red stickers and green stickers are equal in the end.
9 u + 20 = 4 u + 60
9 u - 4 u = 60 - 20
5 u = 40
1 u = 40 ÷ 5 = 8
Number of stickers that Adam has now
= 9 u + 20 + 4 u + 60
= 9 u + 4 u + 20 + 60
= 13 u + 80
= 13 x 8 + 80
= 104 + 80
= 184
Answer(s): 184