Question 1 - Figure it out - Page 102 to 105 - Chapter 4 Class 7 - Expressions using Letter-Numbers (Ganita Prakash)

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Question 1 One plate of Jowar roti costs ₹30 and one plate of Pulao costs ₹20. If x plates of Jowar roti and y plates of pulao were ordered in a day, which expression(s) describe the total amount in rupees earned that day? (a) 30x + 20y (b) (30 + 20) × (x + y) (c) 20x + 30y (d) (30 + 20) × x + y (e) 30x – 20yGiven Cost of one plate Jowar roti = ₹ 30 Cost of one plate pulao. ₹ 20 And, Number of plates of Jowar roti = x Number of plates of pulao = y Now, Total amount earned = Number of plates of Jowar roti × Cost of one plate Jowar roti + Number of plates of pulao × Cost of one plate pulao = x × 30 + y × 20 = 30x + 20y This matches option (a)