Today's PUZZLE CLASSIC OF THE DAY
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Boston - New York Trains
A train departs Boston for New York. An hour later, another train departs New York for Boston. Both trains travel at the same speed. Which of them will be at a shorter distance from Boston at the moment of their meeting? Show it with the sliding trains. Note: the trains’ lengths can be neglected.
Big & Small
When it's alone, it's big. When it's with others, it's small. What is it?
Trilateral Walk
One can walk 1 mile north, 1 mile west, 1 mile south and end up where the journey has started. Where the person should start such a journey from?
Aging
In 10 years the total age of two brothers and two sisters will be 100 years. What will be their total age in 7 years from now?
Not a Nickel
In my hand, I hold two coins that are newly minted. Together they total 30 cents. One isn’t a nickel. How come?
The Hindu Squares
How many different squares can you find in this picture?
The Triangular Cat
How many different triangles can you spot in the picture of this cat?
T into 3 Congruent Parts
Cut this figure into 3 congruent parts (identical in area and shape).
Pyramid to 3 Congruent Parts
Cut this figure into 3 congruent parts (identical in area and shape).
The Four Knights
Cut the chessboard into 4 congruent parts, each with a knight on it.
Cutting the Shape: Getting the Square
This shape can be cut into 2 pieces, so that when re-arranged they can produce a regular square. Can you show them in the shape?
O into the Square
Cut this shape into two parts of the same area and shape so that they can be rearranged to create a perfect 8x8 square.