A recipe uses 5 cups of flour for every 2 cups of sugar how much flour is needed for 1 cup of sugar need this fast ;-; plz help

There are a couple of ways to look at this.  1)  Set up a ratio:  2 cups sugar to 5 cups flour = 5 cups sugar to x cups flour                            2/5 = 5/x                            cross multiply                            2x = 25                            x = 12 1/2 cups flour  2)  Look at the factor by which the cups of sugar was increased and increase     the cups of flour by the same factor.     2x = 5     x = 2.5    The sugar was increased by a factor of 2.5 so increase flour by same factor.    5(2.5) = 12 1/2 cups flour