Prove that half of nine equal four. Ah! Click here to read the solution. SelectShow> IX, using roman numerals, you take the upper half of them and it equals four (IV). Related Share Brain TeaserFacebookGoogle+TwitterPinterestLinkedIn Related Brain Teaser:The Cassette RecorderJanuary 18, 2018Crack The CodeJanuary 18, 2018The Crime SceneJanuary 18, 2018The ShooterJanuary 18, 2018