Question

Karen,Sam, and Hector order a pizza.

Karen eats 1/3 of the pizza, Sam eats 1/3 of
what is left after Karen is done, and Hector
eats 1/3 of what is left after Sam is done.
What part of the pie is left after Hector is
done?

Answer 1

After Hector is done, 1/9 of the pizza is left. This is because Karen ate 1/3 of the pizza, Sam ate 1/3 of the remaining 2/3, and Hector ate 1/3 of the remaining 2/3. Once Hector is done, there is only 1/9 of the pizza left.