Question 612492
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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