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Question In a restaurant, a fruit juice costs ₹ 15 less than a chocolate milkshake. If 4 fruit juices and 7 chocolate milkshakes cost ₹ 600, find the cost of the fruit juice and milkshake.
Let the cost of a chocolate milkshake be ₹ x. Cost of fruit juice = ₹(x – 15) Cost of 4 fruit juices and 7 chocolate milkshakes = ₹ 600 According to the question 4(x – 15) + 7x = 600 ⇒ 4x – 60 + 7x = 600 ⇒ 4x + 7x = 600 + 60 ⇒ 11x = 660 ⇒ x = 60 Cost of 1 chocolate milkshake = ₹ 60 Cost of 1 fruit juice = ₹ 60 – ₹ 15 = ₹ 45