Question: If 20 liters of milk cost $30, how much will 25 liters cost?
A) $37.50
B) $40
C) $45
D) $50
Solution:
Step 1: Find the cost per liter of milk.
Cost per liter=30dollars/20liters = 1.5dollars/liter
Step 2: Use the unitary method to find the cost of 25 liters.
Cost of 25 liters=25liters×1.5dollars/liter=37.5dollars
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