If 9 notebooks cost ₹135, how much will 20 notebooks of the same type cost?
₹300
Cost varies in direct proportion to the number of notebooks, so first find the cost of one notebook.
Cost of one notebook \(= \frac{135}{9} = 15\) rupees.
Cost of 20 notebooks \(= 20 \times 15 = 300\) rupees.
Hence, 20 notebooks cost \(₹300\).
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