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0 / 60 seg.
What is the maximum possible number of times you can subtract number 5 from number 25?
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5
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5
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Clue
MAKE 2 PILES WITH EQUAL NUMBER OF COINS. NOW, FLIP ALL THE COINS IN ONE OF THE PILE. HOW THIS WILL WORK? LET'S TAKE A LOOK AT AN EXAMPLE. SO INITIALLY THERE ARE 5 HEADS, SO SUPPOSE YOU DIVIDE IT IN 2 PILES. P1 : H H T T T P2 : H H H T T NOW WHEN PILE P1 IS FLIPPED: P1 : T T H H H THE NUMBER OF HEADS IN P1 AND P2 ARE EQUAL NOW
ONLY ONCE. THIS IS BECAUSE WHEN YOU SUBTRACT 5 FROM 25 FOR THE FIRST TIME, IT BECOMES NUMBER 20, THEN 15 AND SO ON
20 TIMES. (8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 98)
ONCE, BECAUSE AFTER YOU SUBTRACT IT'S NOT 25 ANYMORE
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