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Rick Blaire, United States
Thursday, May 2, 2024
"Below is my answer to this month’s podcast puzzle:
90% brought a pen.
85% brought a pencil.
80% brought a calculator.
65% brought a ruler.
To determine what minimum percentage of students brought all items, let’s examine how many did not bring at least one item.
10% did not bring a pen.
15% did not bring a pencil.
20% did not bring a calculator.
35% did not bring a ruler.
If we assume these do not overlap, adding these percentages will be the maximum number of students that did not bring at least one item 80%). Thus, the remaining percentage is the minimum number of students (20%) that brought all four items to class. "