12 cups of flour for serving 24 people how much needed 20 people?

If 12 cups of flour are needed to serve 24 people, to serve 20 people we can calculate the amount of flour needed using the proportion:

Amount of flour needed for 20 people = (Amount of flour needed for 24 people) * (20 people / 24 people)

Substituting the given values:

Amount of flour needed for 20 people = 12 cups * (20 people / 24 people)

Amount of flour needed for 20 people = 12 cups * (5/6)

Amount of flour needed for 20 people = 10 cups

Therefore, 10 cups of flour are needed to serve 20 people.