SOLUTION: She gave away 6 radios as gifts, sold the rest for $10 more than she paid for each radio, and broke even. How many radios did she buy?

Question 356394: She gave away 6 radios as gifts, sold the rest for $10 more than she paid for each radio, and broke even. How many radios did she buy?
Answer by JBarnum(2146) (Show Source): You can put this solution on YOUR website!
to many unknowns for me,ive been looking at this for a half hour if i had the total amount spent i could get an answer.
i get total amount of radios=x
where y= the rest of the radios
so
but then the "z" variable is the total amount spent and "c" the cost of 1 radio
so and

well ill give it a shot, to solve for x
substitute z
substitute y

.
??
dunno i need one more known variable

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