The ratio of the number of red stickers to green stickers is 9 : 7.
After Adam buys 40 red stickers and 60 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
| |
Red |
Green |
| Before |
9 u |
7 u |
| Change |
+ 40 |
+ 60 |
| After |
9 u + 40 |
7 u + 60 |
The number of red stickers and green stickers are equal in the end.
9 u + 40 = 7 u + 60
9 u - 7 u = 60 - 40
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 9 u + 40 + 7 u + 60
= 9 u + 7 u + 40 + 60
= 16 u + 100
= 16 x 10 + 100
= 160 + 100
= 260
Answer(s): 260
