4/6 is a proper fraction. Proper fractions can't become improper fractions.
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The numerator of the improper fraction is 4*6 + 3 = 27 and the denominator is the same as for the mixed fraction. So, the improper fraction is 27/4.
27/4
4 and 1/6 = 25/6
It is 25/4.
25/6 is already an improper fraction which is 4 and 1/6 as a mixed number