Jack buys 4/3 pounds of plums. martin buys 6/3 pounds of apples. who buys more fruit

Martin bought more fruit. If both fractions have a denomiator of 3, and Jack buys 4/3, and Martin buys 6/3, it's obviously Martin. 6 is more than 4. We don't have to worry about the denominator.
~Silver

Hello!

Martin buys more fruit, because 6/3 is greater than 4/3. You can check which fraction is greater by converting it into a decimal, as decimals are sometimes easier to compare. 

4 / 3 = 1.3 (Repeating)

6 / 3 = 2

As you can see, 2 is greater than 1.3 Repeating, so 6/3 pounds are greater than 4/3 pounds.