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You wallet contains 39 coins , consisting entirely of nickels and dimes , worth a total of $2.55. How many nickels are in the jar

 Jun 28, 2020
 #1
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n = nickels                 value      5n

d = dimes = 39 - n      value    10(39-n)              summed = 255

 

5n + 10(39-n) = 255

-5n  = -135

n=27  

 Jun 28, 2020
 #2
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You wallet contains 39 coins , consisting entirely of nickels and dimes , worth a total of $2.55. How many nickels are in the jar 

 

Is this a gotcha trick question?  You say 39 coins in my wallet, then ask how many nickels in a jar.  This is impossible to tell from the facts that are provided.  It reminds me of the question:  if an airplane crashes exactly on the border between Texas and Oklahoma, in which state would the survivors be buried?  Well, of course you don't bury survivors.  And I don't know how many nickels are in the jar.   

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 Jun 28, 2020

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