Question 115407
Let x=amount of flour needed for 15 people

Now lets set up a ratio:

3/4 is to 6 as x is to 15 and this is written as follows

(3/4)/6=x/15  The LCM is 30, so we multiply each side by 30

((30)(3/4))/6=30x/15 simplifying

15/4=2x  multiply each side by 4

15=8x  divide both sides by 8
x=15/8 cup
ANOTHER WAY:

(3/4) cup for 6 people means (1/6)(3/4) or (3/24) or (1/8) cup per person

Now if we have 15 people, then we need (1/8)(15) or 15/8 cups

Hope this helps---ptaylor