You divide the part by the total.
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Multiply the whole nomber of total points by the fraction.
mass fraction of Substance A = (mass of Sub. A) / (total mass)
It is the denominator of the original fraction. If the fraction has been simplified you have no way to get back to the total.
First add all the fractions together. Then, divide this sum by the total number of fractions that were in the set. This quotient is your average fraction.
In the original fraction it is the denominator but if the fraction has been simplified you are out of luck. There is no way to recover the value of the total (nor the parts) from a simplified fraction.