What is the better buy? 15 ounces for 1.79 or 12 ounces for 1.49

15:1.79 or 12:1.49

make fractions

15/1.79

12/1.49

find LCM of 12 and 15

find factors of 12 and 15

12=2 times 2 times 3

15=3 times 5

LCM=2 times 2 times 3 times 5=60

multiply 15/1.79 by 4/4=60/7.16

multiply 12/1.49 by 5/5=60/7.45

7.45>7.16 so therefor 12oz for 1.49 is better