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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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You need to be more specific (and less parochial) about units. E.g. your gallons appear to be US gallons, but the most of the world uses imperial gallons. This applies to a number of different measures, mainly of volume. See: https://en.wikipedia.org/wiki/Comparison_of_the_imperial_and_US_customary_measurement_systems. Also "English" is the wrong way to describe US/Imperial units.
The result should be checked for approximate equality. As of now, it's impossible to solve the kata without knowing how exactly you're calculating the new values.
Apparently
3.5g = 3.5 * 3.7854l = 13.2489l