Respuesta :
20 quarts of oil I believe! 3 Times 6 equals 18 and 6 Times 1/3 equals 2 so 2 Plus 18 equals 20.
6*3.3333=20
cause if 6 buses EACH need 3.3333 quarts in total, ther is 6*3.3333
cause if 6 buses EACH need 3.3333 quarts in total, ther is 6*3.3333