9/105 = 3/35. It is not a mixed number but, if you MUST write it as a mixed number you could write it as 03/35 although I cannot imagine why any sensible person would wish to do so.

first you multiply the whole number by the denominator then add the numerater to the product then put the answer over the denominator e.g. 5 4/7 5x7=35 35+4=39 39 over 7 TADA!!

Since these numbers have no common factors, the fraction can't be simplified. Of course, you can convert it to decimal (divide 35 / 24), or expand the fraction (multiply numerator and denominator by some number).