Puzzles - Brain Teasers - Logic Problems (21-30)
Each box had a label on it reading "BBB" (Three Black) or "BBW" (Two Black, One White) or "BWW" (One Black, Two White) or "WWW" (Three White). The girls were told that none of the four labels correctly described the contents of the box to which it was attached. Each girl was told to draw two balls from her box, at which point the blindfold would be removed so that she could see the two balls in her hand and the label on the box assigned to her. As each girl drew balls from her box, her colors were announced for all the girls to hear but the girls could not see the labels on any boxes other than their own. The first girl, having drawn two black balls, looked at her label and announced: "I know the color of the third ball!" The second girl drew one white and one black ball, looked at her label and similarly stated: "I too know the color of the third ball!" The third girl withdrew two white balls, looked at her label, and said: "I can't tell the color of the third ball." Can you do the same?