Answer:
The answer to your question is: 1 bag of apples cost $6.
Explanation:
We need to write an equation:
1 bag of apples + 3 cartons of strawberries = $18
but 1 bag of apples = 1.5 cartons of strawberries
So
1.5 cartons of strawberries + 3 cartons of strawberries = $18
simplify 4.5 cartons of strawberries = 18
1 carton of strawberries = 18/ 4.5 = 4
finally 1 bag of apples = 1.5 (4) = 6