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0 / 60 seg.
Double it and multiply it by 4. Then divide it by 8 and you'll have it once more. What number is it?
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Clue
ONLY ONCE. THIS IS BECAUSE WHEN YOU SUBTRACT 5 FROM 25 FOR THE FIRST TIME, IT BECOMES NUMBER 20, THEN 15 AND SO ON
27 STUDENTS. THE NUMBER OF BOYS MUST BE A MULTIPLES OF 3 (3, 6, 9, 12, ...) SO THAT IT CAN BE SPLIT IN THE RATIO OF 2:1 (NO WATCH:WATCH). THE NUMBER OF GIRLS IS DOUBLE THE NUMBER OF BOYS - 6, 12, 18, 24, ETC. SO THE TOTAL NUMBER OF STUDENTS CAN ONLY BE 9, 18, 27, 36, ETC
20 TIMES. (8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 98)
ANY NUMBER. IF A NUMBER IS DOUBLED AND MULTIPLIED BY 4, IT'S ACTUALLY BEEN MULTIPLIED BY 8, SO DIVIDING BY 8 WILL GET YOU THE ORIGINAL NUMBER AGAIN
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