Peter R. answered 09/12/22
Experienced Instructor in Prealgebra, Algebra I and II, SAT/ACT Math.
Use the unit analysis method to set up a "daisy chain" of conversion rates (fractions) set up so the units "cancel" and you're left with the desired result: gals/wk.
7days/1wk x 1.5 cups/day x 1 pt/2 cups x 1 qt/2pts x 1 gal/4 qts = gal/wk?