Hi, 

Let x represent the number of pennies, then 2x represents the number of dimes

x + 10*2x = 231 cents

solve for x

21x = 231 

x = 11 the number of pennies

2*11 = 22 the number of dimes

checking our answer

11 cents + 220 cents = 231 cents = $2.31



 

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