The ratio of the number of green stickers to red stickers is 9 : 7.
After Adam buys 40 green stickers and 50 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 |
+ 40 |
+ 50 |
After |
9 u + 40 |
7 u + 50 |
The number of green stickers and red stickers are equal in the end.
9 u + 40 = 7 u + 50
9 u - 7 u = 50 - 40
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 9 u + 40 + 7 u + 50
= 9 u + 7 u + 40 + 50
= 16 u + 90
= 16 x 5 + 90
= 80 + 90
= 170
Answer(s): 170