How many 3/4 kilograms can fit inside 20 kilograms? (Hint: Divide.)

There are infinitely-many choices. One quick way of finding such a fraction is to convert the two given fractions to a common denominator, and then find some other fraction of the same denominator that is between the two numerators.

Convert them all to the same denominator, and subract each from 1. Whichever one has the smallest answer was the biggest (and thus closest to 1).

This one works just like the first one, above.