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2. Water pouring puzzle - Wikipedia

   en.wikipedia.org/wiki/Water_pouring_puzzle

   Water pouring puzzle. Starting state of the standard puzzle; a jug filled with 8 units of water, and two empty jugs of sizes 5 and 3. The solver must pour the water so that the first and second jugs both contain 4 units, and the third is empty. Water pouring puzzles (also called water jug problems, decanting problems, [1][2] measuring puzzles ...

3. Index card - Wikipedia

   en.wikipedia.org/wiki/Index_card

   The most common size for index card in North America and the UK is 3 by 5 inches (76.2 by 127.0 mm), hence the common name 3-by-5 card. Other sizes widely available include 4 by 6 inches (101.6 by 152.4 mm), 5 by 8 inches (127.0 by 203.2 mm) and ISO-size A7 (74 by 105 mm or 2.9 by 4.1 in). [4] [5] Cards are available in blank, ruled and grid ...

4. Divisibility rule - Wikipedia

   en.wikipedia.org/wiki/Divisibility_rule

   If the hundreds digit is odd, the number obtained by the last two digits must be 4 times an odd number. 352: 52 = 4 x 13. Add the last digit to twice the rest. The result must be divisible by 8. 56: (5 × 2) + 6 = 16. The last three digits are divisible by 8. [2][3] 34,152: Examine divisibility of just 152: 19 × 8.

5. Envelope - Wikipedia

   en.wikipedia.org/wiki/Envelope

   Envelope. Front of an envelope mailed in the U.S. in 1906, with a postage stamp and address. Back of the above envelope, showing an additional receiving post office postmark. An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card.

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

7. Magic square - Wikipedia

   en.wikipedia.org/wiki/Magic_square

   This sum can also be found in the four outer numbers clockwise from the corners (3+8+14+9) and likewise the four counter-clockwise (the locations of four queens in the two solutions of the 4 queens puzzle [50]), the two sets of four symmetrical numbers (2+8+9+15 and 3+5+12+14), the sum of the middle two entries of the two outer columns and rows ...