The ratio of the number of green stickers to red stickers is 9 : 7.
After Adam buys 70 green stickers and 80 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
9 u |
7 u |
Change |
+ 70 |
+ 80 |
After |
9 u + 70 |
7 u + 80 |
The number of green stickers and red stickers are equal in the end.
9 u + 70 = 7 u + 80
9 u - 7 u = 80 - 70
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 9 u + 70 + 7 u + 80
= 9 u + 7 u + 70 + 80
= 16 u + 150
= 16 x 5 + 150
= 80 + 150
= 230
Answer(s): 230