This month’s brain teaser is not so bad! Yes, it requires thought (reasoning!), but it is doable. Give it a try!
You have a three gallon and a five gallon measuring device. You can fill the containers with water as many times as you like or pour water from one container to another as many times as you like. How can you measure out four gallons?
Answer:
Fill the five gallon container. Pour all but two gallons into the three gallon container. Empty the three gallon container. Put the two remaining gallons from the five gallon container into the three gallon container. Fill the five gallon container one more time. Pour one gallon from the five gallon container by filling the three gallon container. Now the five gallon container contains four gallons.