Actually Welcome to the Concept of the ratio and percentages.
let's be the total kalguksu soup quantity be x
hence, 60% of x = 24 cups, so we get as
===> 60/100 * x = 24
=> 0.6*x = 24
hence, x ==> 24/0.6
=====> x = 40 cups
hence the answer is 40 cups are in total kalguksu soup.