Euler problem

Someone buys a 180 tolars towels. If it was for the same money of 3 more towels, it would be 3 tolars cheaper each. How many were towels?

Correct result:

n =  12


180=cn 180=(c3)(n+3) n>0  n=12 c=15180=c n \ \\ 180 = (c-3)(n+3) \ \\ n>0 \ \\ \ \\ n = 12 \ \\ c = 15

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