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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
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
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
THREE. THEY'RE ALL IN A ROW, DUCK 1, DUCK 2 FOLLOWED BY DUCK 3. SO DUCKS 1 AND 2 ARE IN FRONT OF DUCK 3, DUCKS 2 AND 3 ARE BEHIND DUCK 1 AND DUCK 2 IS IN THE MIDDLE
YOU NEED TO TAKE OUT THREE SOCKS. TO HAVE A MATCHING PAIR, YOU NEED TO TAKE 2 SOCKS THAT ARE OF THE SAME COLOR. WHEN YOU TAKE 3 SOCKS, 2 OF THE SOCKS WILL BE OF THE SAME COLOR
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