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Harrison has $9.30 in his coin collection, all in pennies and dimes. The number of dimes is three times the number of pennies. How many coins of each type does he have?

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sqdancefan

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Answer:

  • 30 pennies
  • 90 dimes

Step-by-step explanation:

A group of 3 dimes and 1 penny is worth $0.31. Harrison's collection has the value of  ...

  $9.30/($0.31/group) = 30 groups

Harrison has 30 pennies and 90 dimes.

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