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Ken has 25 coins in nickels and dimes only. He has a total of $1. 65. How many dimes does he have? 

Guest Apr 20, 2017
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Let x = dimes ,    ( 25 - x )  = nickels

 

Number of dimes * value each + Number of nickels * value each  = Total Value

 

So.....

 

x * 10   +   (25 - x) * 5    =   165       simplify

 

10x + 125 - 5x   = 165

 

5x + 125  =  165      subtract 125 from both sides

 

5x   =  40             divide both sides by 5

 

x  =  8   dimes

 

 

 

cool cool cool

CPhill  Apr 20, 2017

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