Hi,

Let x represent number of dimes

Question states*** CENTS makes sense

 10x + 5(50-x) = 340 cents

  10x + 250-5x = 340 cents

      5x = 90

       x = 18, number of dimes.  There are 32 Nickels



CHECKING our answer***

 180 + 160 = 340 cents or $3.40

Wish You the Best in your Studies.

 

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