Let the original price of rice be 100 units and the original consumption be 100 units, making the expenditure 100 * 100 = 10,000 units.
After a 20% increase, the new price is 120 units.
To keep the expenditure the same, the new consumption should be 10,000 / 120 = 83.33 units.
The reduction in consumption is 100 - 83.33 = 16.67 units.
The percentage reduction in consumption is (16.67 / 100) * 100 = 16.67%.
Answer: 16.7%
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