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BOTH ENDS ARE NAILED WITH THE SAME NAIL. IN ORDER FOR THE 10 FOOT CHAIN TO DIP DOWN 5 FEET, IT MUST DIP 5 FEET DOWN AND 5 FEET UP, TOTALING THE LENGTH OF THE CHAIN 66 SECONDS. WHEN THE CLOCK STRUCK SIX, THERE WERE ONLY 5 INTERVALS BETWEEN STROKES, AND EACH INTERVAL WAS 6 (30/5) SECONDS. BETWEEN THE FIRST AND TWELFTH STROKES THERE WILL BE 11 INTERVALS OF 6 SECONDS EACH; THEREFORE, 12 STROKES WILL TAKE 66 SECONDS THE JOB CAN BE DONE FOR $5. OPEN ALL THE FIVE LINKS FROM ONE CHAIN AND USE THEM TO JOIN THE REMAINING CHAINS TOGETHER (A). NEITHER (B). A POUND OF METAL IS ALWAYS MORE THAN HALF A POUND OF THE SAME METAL. (C). SIX STROKES TOOK 30 SECONDS, THEREFORE 12 STROKES WILL TAKE 60 SECONDS. BUT WHEN THE CLOCK STRUCK SIX, THERE WERE ONLY 5 INTERVALS BETWEEN STROKES, AND EACH INTERVAL WAS 30/5=6 SECONDS. BETWEEN THE FIRST AND TWELFTH STROKES THERE WILL BE 11 INTERVALS OF 6 SECONDS EACH, THEREFORE 12 STROKES WILL TAKE 66 SECONDS. (D). THERE IS ALWAYS A PLANE THAT CONTAINS ANY 3 POINTS