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Perfect Eggs

Math brain teasers require computations to solve.


Fun:*** (2.6)
Difficulty:** (1.92)
Submitted By:gokaran


For his breakfast, Mr Stone likes an egg that has been boiled for exactly 9 minutes. He has two egg timers (those with sand in them), one that runs for 4 minutes and one that runs for 7 minutes. How can he use these timers to boil his egg?

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