Question 469981
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Hi,
Sally has seven times as many dimes as nickels
Let x and 7x represent the number of nickels and dimes respectively
  5x + 10*7x = 300   |CENTS makes sense
     75x = 300
       x = 4, the number of nickels.  there were 28 dimes

CHECKING our Answer***
 5*4 + 10*28 = 300cents or $3.00