To answer this we need to set up a proportion. We can use 2.5 cups/5 servings = x cups/8 servings for our proportion.
Now to find x we cross multiply the fractions (numerator of first fraction times denominator or second fraction, and numerator of second fraction times denominator of first fraction):
2.5/5=x/8
20=5x
20/5=x
4=x
So now we know that 4 cups are needed for 8 servings.
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