Alistair of Histon and Impington Infants School sent us a very
    clearly explained solution to this problem: <br />
     <br />
    Fred did not cut his into four pieces, because it is the same
    as Charlie and David's only cut again, which means that he had
    eight pieces.<br />
     I have spotted that David and Charlie both cut their cubes
    into cuboids. <br />
    The six cubes shown were cut by: <br />
    David, Belinda, Andy, <br />
    Ellie, Charlie, and Gill <br />
    <br />
    Thank you Alistair!<br />