TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Reds can benefit from seven to _ years' aging .

SOLUTION: nine

PROBLEM: Men are _ times as likely as women to complete suicide.

SOLUTION: three

PROBLEM: Natural samarium is a mixture of seven isotopes, _ of which are unstable with long half-lives.

SOLUTION:
four