The ratio of the number of red stickers to green stickers is 5 : 3.
After Adam buys 10 red stickers and 30 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
5 u |
3 u |
Change |
+ 10 |
+ 30 |
After |
5 u + 10 |
3 u + 30 |
The number of red stickers and green stickers are equal in the end.
5 u + 10 = 3 u + 30
5 u - 3 u = 30 - 10
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 5 u + 10 + 3 u + 30
= 5 u + 3 u + 10 + 30
= 8 u + 40
= 8 x 10 + 40
= 80 + 40
= 120
Answer(s): 120