Question: If 5 kg of grapes cost $25, how much will 15 kg cost?
(A) $60
(B) $65
(C) $70
(D) $75
Solution:
Step 1: Find the cost per kg of grapes.
Cost per kg= 25dollars⁄5kg = 5dollars/kg
Step 2: Use the unitary method to find the cost of 15 kg.
Cost of 15 kg=15kg×5dollars/kg=75dollars
.
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