Question: If 12 liters of oil cost $48, how much will 9 liters cost?
A) $30
B) $32
C) $34
D) $36
Solution:
Step 1: Find the cost per liter of oil.
Cost per liter=48dollars/12liters = 4dollars/liter
Step 2: Use the unitary method to find the cost of 9 liters.
Cost of 9 liters=9liters×4dollars/liter=36dollars
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