A box contains red, blue, and green balls. If there are twice as many red balls as blue balls and three times as many green balls as red balls, which color has the least number of balls?
In a group of five friends: Alice, Bob, Charlie, David, and Eva, the following conditions are given: 1) Alice is not friends with Bob. 2) Charlie is friends with both David and Eva. 3) Bob is friends with Eva but not with David. Who can be selected as friends of Charlie?
A team of three players is to be selected from the following: X, Y, Z, A, and B. The selection rules are: 1) X and Y cannot be selected together. 2) Z must be included if A is included. 3) B can only be included if Y is not included. Which of the following selections is valid?
In a race, the following conditions are given: Runner A finished before Runner B but after Runner C. Runner D finished after Runner A. Who finished last?
A team of four members is to be formed from the following individuals: X, Y, Z, W, and V. The selection criteria are: 1) X cannot be selected if Y is selected. 2) Z must be included if W is included. 3) V can only be included if X is not included. Which of the following combinations meets the selection criteria?