The ratio of the number of blue stickers to green stickers is 9 : 7.
After Adam buys 40 blue stickers and 80 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 |
+ 40 |
+ 80 |
After |
9 u + 40 |
7 u + 80 |
The number of blue stickers and green stickers are equal in the end.
9 u + 40 = 7 u + 80
9 u - 7 u = 80 - 40
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has now
= 9 u + 40 + 7 u + 80
= 9 u + 7 u + 40 + 80
= 16 u + 120
= 16 x 20 + 120
= 320 + 120
= 440
Answer(s): 440