The ratio of the number of red stickers to green stickers is 5 : 2.
After Adam buys 60 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 |
5 u |
2 u |
Change |
+ 60 |
+ 90 |
After |
5 u + 60 |
2 u + 90 |
The number of red stickers and green stickers are equal in the end.
5 u + 60 = 2 u + 90
5 u - 2 u = 90 - 60
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stickers that Adam has now
= 5 u + 60 + 2 u + 90
= 5 u + 2 u + 60 + 90
= 7 u + 150
= 7 x 10 + 150
= 70 + 150
= 220
Answer(s): 220