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At the market, 5 light bulbs cost $9dollar How much do 7 light bulbs cost?
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At the market, 5 light bulbs cost $9dollar 
How much do 7 light bulbs cost?

User Ddekany
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1 Answer

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The answer is $12.60, because $9/ 5 lightbulbs is $1.80 per lightbulb. Next you take the $1.80 per lightbulb and multiply it by 7 lightbulbs.
User Rhunwicks
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