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Do You Brush Your Teeth Every Day?
Age 14 to 18
Challenge Level 
You might find it helpful to draw a two-way table, a Venn diagram or a tree diagram, in order to work out the proportions and any missing numbers.
For simplicity, assume that exactly $\frac{2}{6}$ of the die rolls land on a 5 or a 6.
If $T$ participants actually brush their teeth daily, how many of them tell the truth?
For simplicity, assume that exactly $\frac{2}{6}$ of the die rolls land on a 5 or a 6.
If $T$ participants actually brush their teeth daily, how many of them tell the truth?
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