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A collection of nickels, dimes and pennies has an average value of 7 cents per coin. If a nickel were replaced by five pennies, the average would drop to 6 cents per coin. What is the number of dimes in the collection? 

 Jan 14, 2019
 #1
avatar+18071 
+2

Try   12 dimes   9 nickles 3 pennies = 168      168/24 = 7

        12 dimes    8 nickles 8 pennies = 168      168/28 = 6

 Jan 14, 2019
 #2
avatar+143 
+3

Sorry, I don't know!!!

 Jan 14, 2019
 #3
avatar+533 
0

look at this: https://web2.0calc.com/questions/a-collection-of-nickels-dimes-and-pennies-has-an

 

HOPE THIS HELPED!

 Jan 14, 2019

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