The ratio of the number of red stickers to green stickers is 8 : 3.
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 |
3 u |
Change |
+ 30 |
+ 90 |
After |
8 u + 30 |
3 u + 90 |
The number of red stickers and green stickers are equal in the end.
8 u + 30 = 3 u + 90
8 u - 3 u = 90 - 30
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has now
= 8 u + 30 + 3 u + 90
= 8 u + 3 u + 30 + 90
= 11 u + 120
= 11 x 12 + 120
= 132 + 120
= 252
Answer(s): 252