The ratio of the number of red stickers to green stickers is 8 : 5.
After Adam buys 30 red stickers and 90 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
8 u |
5 u |
Change |
+ 30 |
+ 90 |
After |
8 u + 30 |
5 u + 90 |
The number of red stickers and green stickers are equal in the end.
8 u + 30 = 5 u + 90
8 u - 5 u = 90 - 30
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has now
= 8 u + 30 + 5 u + 90
= 8 u + 5 u + 30 + 90
= 13 u + 120
= 13 x 20 + 120
= 260 + 120
= 380
Answer(s): 380