Description
STEP 1: Think of a number.
STEP 2: Double it.
STEP 3: Add 5.
STEP 4: Add 12.
STEP 5: Subtract 3.
STEP 6: Divide by 2.
STEP 7: Subtract your first number.
YOUR ANSWER SHOULD BE 7. WHY DOES THIS TRICK WORK?
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Explanation & Answer
assume the origin number is x,
step 2 2x
step 3+4+5: 2x+14
step 6: x+7
and step 7: x
you always go back x, that is the trick.
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