Let us assume that Ryo's restaurant needs "x" eggs.
This means that Ryo accidentally ordered 240% times this number, that is to say, Ryo accidentally ordered
times the eggs his restaurant really needs.
Therefore the total number of eggs Ryo ordered would be
.......(Equation 1)
Therefore, the fraction of the eggs his restaurant really needs did Ryo ordered will be calculated by dividing (Equation 1) by the the number of eggs the restaurant really needs, which is "x".

Thus,
is the required fraction.