4. The decimal equivalent of 503 2/3 is
. This is exactly the same as the measurement Chef B presented. (Though, we doubt Chef B could prove that the decimal number went on forever as suggested by the overline over the 66.)
If Chef A's measurement were rounded to the nearest tenth, it, too, would be 503.7 ft.
Both measurements should be put into the same form before a judgment is made as to which is greater.