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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