Milo is making 1 1/2 batches of muffins. If one batch calls for 1 3/4 cups flour how much flour will he need?

1 / (1 3/4) = (1 1/2) / x ... 1 batch to 1 3/4 c of flour = 1 1/2 batches to x c of flour

lets turn our mixed numbers to improper fractions

1 / (7/4) = (3/2) / x

now cross multiply because this is a proportion

(1) (x) = (7/4) (3/2)

x = 21/8 = 2 5/8 ... so 2 5/8 cups of flour are needed to make 1 1/2 batches