A valid question is one that:
a) has relevance and some degree of connectivity to the topic
b) is logicall consistent (ie should have only one unambiguouis interpretation).
c) can be expected to have an answer that is realistic (ie. is known or can be known, eg with further research)
d) may have multiple answers but these should be testable (ie. evidence based). Multiple answers will probably result from imprecision in defining the question. Eg. different people may have different answers to the swame question if they have different experiences and different points of view.
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This humanised question maker is preposterous with its valid question rules.
thats not a valid question a toonie is money and a gallon is a unit of measure
The question contains a number with two decimal points: not valid.
There is no valid mathematical solution to the question.
You could try substituting the solution into the original question and check whether it is valid.