The Producers is a musical adapted by Mel Brooks and Thomas Meehan from Brooks' 1968 film of the same name, with lyrics written by Brooks and music composed by Brooks and arranged by Glen Kelly and Doug Besterman.
8 ounces = 1 cup 4 ounces = 1/2 cup So yes, 12 ounces is equal to 1 1/2 cups.
To convert from ounces to cups, multiply the ounce value by 0.125 (or divide it by 8). For example, to find out how many cups there are in 16 ounces, multiply the ounce value by the conversion factor, that makes 16 * 1/8 = 2 cups in 16 ounces.