## Prealgebra (7th Edition)

$\frac{22}{1}=\frac{55}{2.5}$
x is to y is the same as $\frac{x}{y}$ So 22 vanilla wafers is to 1 cup of cookie crumbs as 55 vanilla wafers is to 2.5 cups of cookie crumbs is the same as $\frac{22}{1}=\frac{55}{2.5}$