Question

Lindsay went to the teacher supply store she bought 10 whiteboards for a total of $35 and some posters for $5.40 each. If she spent $51.20 total, how many posters did Lindsey buy

Answer 1

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Amount spent on posters
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$51.20 - $35 = 16.20

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Number of posters
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$16.20 ÷ $5.40 = 3

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Answer: 3 Posters
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Answer 2

The whiteboards she bought cost $35, and she spent a total of $51.20, subtract to find out the total amount she spent on posters:

$\sf 51.20-35=16.2$

So she spent a total of $16.20 on posters, now divide by the amount one poster costs to find out how many posters she bought.

$\sf 16.2\div 5.4=\boxed{\sf 3}$

So she bought 3 posters.