Saeed bought 21 1/2 lb. of ground beef. He used 1/4 of the beef to make tacos and 2/3 of the remainder to make quarter-pound burgers. How many burgers did he make
(43/2)(3/4)= 129/8 left after tacos
(2/3)(129/8) used for burgers
times 4 for number of 1/4 lb burgers
4(2/3)(129/8) = 129/3 = 43 burgers