In 1990 a person is 15 years old. In 1995 that same person is 10 years old.
How is this possible?
The years are in B.C (Before Christ).
Thus, 1990 in BC will gives 15 years old and 1995 in BC will gives 10 years old.
You have a three gallon and a five gallon measuring device.
How to measure out four gallons?
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. 🙂
