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 Puzzle 817 What is represented by this BrainBat? SPELER [Ref: ZGXU]   Hint: Say what you see. Answer: Bad speller. Puzzle 818 What has roads but no cars, rivers but... ...no water and hills but no trees? [Ref: ZUIX]   Hint: Something that you might use quite often. Answer: A map. Puzzle 819 If a farmer buys chicken feed for 57c per tonne, pig feed for \$1.52 per tonne and cattle feed for 43c per tonne. How much of each would he have if he had 100 tonnes for \$100? [Ref: ZUPW] © Kevin Stone  Hint: Answer: 49 tonnes of chicken feed, 46 tonnes of pig feed and 5 tonnes of cattle feed. Puzzle 820 Starting with COOL, change one letter at a time until you have the word HEAT. Each change leaves the other letters in their original places and must result in a proper word. What is the minimum number of steps required to achieve this change? [Ref: ZZUI]   Hint: The first change takes COOL to COAL. Answer: 5 steps.   COOL, COAL, COAT, BOAT, BEAT, HEAT or    COOL, COOT, MOOT, MOAT, MEAT, HEAT or    COOL, COOT, COAT, MOAT, MEAT, HEAT.