Math

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Half the pupils in Mrs. Cross's class are boys. Half the boys have blue eyes. Half the blue-eyed boys have blond hair. There are three boys with blue eyes and blond hair in Mrs.Crooss's class. How many pupils are there total in that class.

  • Math -

    "There are three boys with blue eyes and blond hair in Mrs.Cross's class."

    Start with 3.

    "Half the blue-eyed boys have blond hair."

    So the above number of 3 only represents half of the blue-eyed boys.

    So, there are 2*3 blue-eyed boys total, which is 6.

    "Half the boys have blue eyes."

    Now we can determine that there are 6*2 boys total.



    Try to determine how many pupils are in the class.

  • Math -

    24

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