a and b i hope this is correct
5 - 1 2/9 = 3 7/9
Hope this helps!
12.8$, you would divide 2.40 by 3 to get the cost per ounce. Then multiply that by 16 to get the cost for one pound.
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
factors of 66: 1, 2, 3 ,6, 11, 22, 66
GCF: 6