At an environmental science camp, an instructor notes that a single energy-efficient solar panel generates an average of 1.5 kilowatt-hours (kWh) of electricity per day. If a sustainable household consumes exactly 9 kWh of electricity daily, how many solar panels must they install to completely cover their daily energy needs?

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• A 6
• B 8
• C 4
• D 12

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Answer: A. 6

Divide the daily need by the output of one panel: 9 ÷ 1.5 = 6 panels.

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