This can be either using a set formula or by a simple act of will.

If the first formula above is used, values can never be greater than one.

The solution in many cases is to use a different formula.

This formula can be used to find out how much time is required.

Because in 2000, using the same formula would make the person minus 55 years old.

The following formula may be used to convert between them.

If the first ball was red then the above formula is used with reduced by one.

As net numbers got added, the following formula was used.

The same fate does not result if the old law's formula is used.

My opinion is that we should not be using formula anyway.