The ratio of the number of red stickers to green stickers is 7 : 2.
After Adam buys 40 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 |
7 u |
2 u |
Change |
+ 40 |
+ 90 |
After |
7 u + 40 |
2 u + 90 |
The number of red stickers and green stickers are equal in the end.
7 u + 40 = 2 u + 90
7 u - 2 u = 90 - 40
5 u = 50
1 u = 50 ÷ 5 = 10
Number of stickers that Adam has now
= 7 u + 40 + 2 u + 90
= 7 u + 2 u + 40 + 90
= 9 u + 130
= 9 x 10 + 130
= 90 + 130
= 220
Answer(s): 220