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0 / 60 seg.
We have a brick of regular size. It weighs 4kg. How much do you think a similar brick, four times smaller, but made of the same material weigh?
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Clue
20 TIMES. THEY ARE 9, 19, 29, 39, 49, 59, 69, 79, 89, 99 (2 TIMES) FOLLOWED BY 90, 91, 92, 93, 94, 95, 96, 97, 98
62.5 GRAMS THE SMALLER BRICK IS NOT ONLY FOUR TIMES SHORTER THAN THE FIRST ONE, BUT IT IS ALSO FOUR TIMES NARROWER AND FOUR TIMES LOWER AND THEREFORE THE RATIO OF THE VOLUME AND WEIGHT IS 4 X 4 X 4 = 64 TIMES. SO 4KG/64 = 62.5 GRAMS
SPLIT THE PILLS INTO 3 GROUPS - 2 GROUPS WITH 3 PILLS EACH AND 1 GROUP WITH 2 PILLS. NOW PUT THE 2 GROUPS OF 3 PILLS ON THE SCALE. SCENARIO #1: BOTH GROUPS WEIGH THE SAME. THIS MEANS THAT THE POISONOUS PILL IS IN THE GROUP WITH 2 PILLS. SO TAKE THE 2 PILLS FROM THAT GROUP AND USE THE SCALE TO DETERMINE THE POISONOUS PILL. SCENARIO #2: ONE GROUP WEIGHS MORE THAN THE OTHER. TAKE ANY 2 PILLS FROM THIS GROUP OF 3 PILLS. IF THEY WEIGH THE SAME, THEN THE 3RD PILL IS THE POISONOUS PILL. IF THEY DON'T WEIGH THE SAME, THEN THE HEAVIER ONE IS OBVIOUSLY THE POISONOUS PILL
THE PATIENT WILL TAKE 1 HOUR TO CONSUME ALL FIVE TABLETS. SUPPOSE HE TAKES THE FIRST TABLET AT 8:00 PM. HE WILL TAKE THE SUBSEQUENT TABLETS AT 8:15 PM, 8:30 PM, 8:45 PM AND 9:00 PM
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