Xiao Ming divided a number by 6 / 7 and calculated it as a number by 6 / 7. The result is 15. What's the correct answer? fast

Let this number be X
Then we can get the equation: X * 6 / 7 = 15, x = 35 / 2
So the correct answer is: X / 6 / 7 = 245 / 12

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