Question
Who among the following rides Harley-Davidson?
Study the following information carefully and answer the questions given below: Joo-won, Ji-hu, Kun-woo, Woo-jin, Ji-hoon, and Min-ho live on different floors in the same building. All of them ride different bikes, vizDueti, Harley-Davidson, Royal Enfield, Benelli, Aprilia, and KTM but not necessarily in the same order. The ground floor is numbered 1, the floor above it is numbered 2, and so on, and the topmost floor is numbered 6. Ji-hu lives on an even-numbered floor and does not ride Harley-Davidson or Royal Enfield. Only two persons live between the floors on which Ji-hu and Min-ho live. Woo-jin lives on the floor immediately above the one on which Kun-woo lives. Woo-jin does not live on an odd-numbered floor and lives immediately below that of the one who ride Dueati.Joo-won does not live on the floor immediately above or immediately below the floor on which Ji-hoon lives. Joo-won does not live on the ground floor. Woo-jin rides Aprilia. Joo-won rides KTM.Solution
: Ji-hu lives on the even floor so the possible floor numbers for him are 2, 4, 6. Ji-hu. Ji-hu cannot live on floor 4 because due to it min-ho will live on floor number 1 and there will be no valid position for Woo-jin hence this possibility is canceled. Also If Ji-hu lives on floor number 6 then Min-ho lives on floor 3 and then Woo-jin lives on floor 2 and Kun-woo on floor 2 but then the position for Ji-hoon is not satisfied hence only condition which is valid for Ji-hu is to sit him at floor number 2.Only two person live between Ji-hu and Min-ho. 
Step 2: Woo-jin lives on even floor and rides Aprilia so the possibility for him are 4 or 6 but Kun-woo lives immediately below Woo-jin so he will live on floor number 4 and Kun-woo lives immediately below it and the person who ride Dueati sits immediately above Woo-jin and thus the arrangement will look as shown below 
Step 3:Joo-won does not lives on the floor number 1 so the only floor left for him is floor 6 and the only person left is Ji-hoon so he sits on floor 1.Joo-won rides KTM. Ji-hu doesn’t ride Harley-Davidson or Royal Enfield so he ride Benelli. Harley-Davidson and Royal Enfield is ride by Kun-woo or Ji-hoon (not necessarily in the same order). 
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