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Gillian purchased 25 books at the library book sale . Each handcover book cost $1.50, and each paperback book cost $0.50. Gillian spent a total of $26.50.  how many paperback books did Gillian buy ?

 Feb 26, 2020
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Let the  number  of paperback  books  = x

Then the number  of hardcover books  = 25  - x

 

So.....we  have

 

number of hardcover * cost each  +  number of paperbacks * cost each = total cost

 

So

 

(25  - x) * 1.50  +  x * .50   =   26.50     simplify

 

37.5 -1.50x  +  .50x   = 26.50

 

37.5  -  x  =  26.50     subtract   37.5  from both sides

 

-x  =  -11     multiply thrugh by  -1

 

x  =11  =  number  of paperbacks purchased

 

 

cool cool cool

 Feb 26, 2020
edited by CPhill  Feb 26, 2020

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