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Roy wanted to get some pens and pencils. He went to a stationery shop that only sells them in boxes. A box of 7 pencils cost $2.50 while a box of 5 pens costs $3.20. Roy wants to buy 19 pencils and 3 pens. What is the least amount of money that he needs to spend on the pens and pencils?

 Jun 22, 2021
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19 pencils is 3 boxes of 7pencils   (you have to pay for the extra 2 even though you do not want them)

3 pens is 1 boxes of 5 pens   (you have to pay for the extra 2 even though you do not want them)

 

So Roy needs to buy 3 boxes of pencils and 1 box of pens.  How much is that going to be?

 Jul 10, 2021

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