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You have a piggy bank a total of 72 coins in dime and quarters . If the piggy bank contains 10.80 how many dime are in the piggy bank

 Mar 7, 2020
 #1
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Let  the  number  of dimes  = D

 

Then the numbers of quarters  =  72 - D

 

So....we  have this

 

Number of dimes * value each  +  Number of quarters * value each  =  total amount

 

D * .10  + (72 - D)* .25  =  10.80    simplify

 

.10D  + 18  - .25D  = 10.80

 

-.15D  +  18  = 10.80    subtract  18  from each side

 

-.15D  = -7.2    divide both sides by  -.15   

 

D  = 48   (dimes)

 

 

cool cool cool

 Mar 7, 2020

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