Multiply the whole nomber of total points by the fraction.
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You divide the part by the total.
mass fraction of Substance A = (mass of Sub. A) / (total mass)
You could write is as 150/1 points per game. This fraction can be simplified.
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.