Hi, 

twice as many dimes as pennies

Let x and 2x represent number of pennies and dimes respectively:

Question states***  CENTS amkes sense

 10(2x)+ x = 231

       21x = 231

         x = 11, number of pennies.  there are 22 Dimes

And:

 $2.20 + $.11 = $2.31

 

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