Lesson Logic problems - The answer to Problem 5

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The answer to Problem 5


Below  (after the  reminder)  is the  answer  to the  Problem 5  of the lesson  Some logic problems  (the topic  Miscellaneous word problems
of the section  Word problems  in this site).
Problem 5 formulation (reminder)
It takes  15  minutes to boil an egg.
How could you boil the egg having two hourglasses that measure  7  and  11  minutes?

Answer
Start running both  11-minutes and  7-minutes hourglasses simultaneously.
When the  7-minutes hourglass emptied,  start to boil the egg.
When  11-minutes hourglass emptied, turn it over and run again.  Continue to boil the egg.
When  11-minutes hourglass emptied again,  boiling of the egg is completed.

Back to the original lesson  Some logic problems  (the topic  Miscellaneous word problems  of the section  Word problems  in this site).
Go to the solution  (the topic  Miscellaneous word problems  of the section  Word problems  in this site).

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