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Three boys each with a 10 cents go to the ice cream parlor to buy a pint of ice cream (at 30 cents a pint). After departing from the store, the proprietor reminded the clerk that the sale price for the day was 25 cents a pint and that he should refund the boys a nickel. 


So the clerk grabbed five pennies, caught up with the boys and gave them each one penny and kept two for himself. Each boy receiving a penny change meant that the boys have now spent only nine cents and two cents remained with the clerk.


3 boys X 9 = 27 + the 2 cents the clerk kept = 29 cents ! What happened to the other penny?


Answer

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The Triangle quandary


Below lies two identical triangles. Each is made up of four identical pieces (shapes).

How is it possible the one at the bottom has a square hole lessening the visible surface area by one unit?






       Answer