Answer:
John used the ginger.
Step-by-step explanation:
Consider the provided information.
When the pie is finished, there is 1/4 cinnamon left, 1/3 of nutmeg, 1/2 of ginger and 5/8 of pumpkin left.
First arrange the them in increasing order.
[tex]\frac{1}{4}< \frac{1}{3}< \frac{1}{2}< \frac{5}{8}[/tex]
It is given that Quincy used the most ingredient, that means Quincy left with least amount of ingredients. The least number among them is 1/4 which is cinnamon.
So Quincy used cinnamon.
It is given that Lucy used the least ingredient, that means most of the her ingredients were left which is pumpkin i.e 5/8
So Lucy used pumpkin.
It is given that Prudence used more ingredient than John, that means Prudence left with the less ingredients as compare to John which is nutmeg i.e 1/3
Thus, Prudence used nutmeg.
Hence, John used the ginger.
