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A piggy bank has nickles and dimes totaling $1.15. If the bank contains exactly 15 coins, how many of each coin are in the bank?

 Jan 16, 2020
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Call  the nuber of nickles  x

So....the number of dimes  = 15 - x

 

So

 

Number of Nickels * Value Each +  Number of Dimes * Value Each  =  Total Value

 

 x * 5   +  (15 - x) * 10  = 115      simplify

 

5x + 150 - 10x  = 115         subtract 150 from both sides

 

-5x  =  -35                divide both sides  by -5

 

x = 7 =  number of nickels

 

15  - 7  = 8  = number of dimes

 

 

cool cool cool

 Jan 16, 2020

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