Take 9 from 6, 10 from 9, 50 from 40 and leave 6. How is this possible? Ah! Click here to read the solution. SelectShow> SIX – 9 (IX) = S 9 (IX) – 10 (X) = I 40 (XL) – 50 (L) = X The answer is therefore SIX. (strange logic for this one) 🙂 Related Share Brain TeaserFacebookGoogle+TwitterPinterestLinkedIn Related Brain Teaser:The Cassette RecorderJanuary 18, 2018Crack The CodeJanuary 18, 2018The Crime SceneJanuary 18, 2018The ShooterJanuary 18, 2018