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The Oil problem is painfully easy.

You have an unknown quantity of oil in a barrel and have only a 3 and 5 gallon containers?

Fill the 3 gallon container. Empty it into the 5 gallon container. Refill the 3 gallon container and use it to fill the 5 gallon container to the full, five gallon mark.

You have just added 2 gallons to the 5 gallon bucket leaving only one gallon in the 3 gallon container.

Love the RL problems heh