The ratio of the number of blue stickers to green stickers is 9 : 7.
After Adam buys 60 blue stickers and 70 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
9 u |
7 u |
Change |
+ 60 |
+ 70 |
After |
9 u + 60 |
7 u + 70 |
The number of blue stickers and green stickers are equal in the end.
9 u + 60 = 7 u + 70
9 u - 7 u = 70 - 60
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 9 u + 60 + 7 u + 70
= 9 u + 7 u + 60 + 70
= 16 u + 130
= 16 x 5 + 130
= 80 + 130
= 210
Answer(s): 210