Each team received a bag containing 10 balls. The bet would be between students and teacher, so the room should come to a consensus and choose one color. This activity was done with students from 8th grade. When I asked them to choose a color, they hesitated because they didn’t know which one offered more chance of winning. Students discussed this question
and the view of one student, a girl who did very well in mathematics, was influential. She chose red, which was the color of 7 balls. Some students opposed this, saying they would receive R$ 16 for the green ball. I knew that I would lose, but I did not interfere. The student’s call prevailed.