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If you are only allowed to press the 1 and 0 keys on a calculator with + - / x =, how many min press required to get 9?

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If you are only allowed to press the 1 and 0 keys on a calculator with any of the add, take, times, divide and equals keys, what is the fewest number of presses needed to make the number 9 on the calculator?

posted May 16 by anonymous

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1 Solution

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I think we need 5 key strokes to do this.
1, 0, -, 1 & =

solution May 16 by Tejas Naik



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You are a spy trying to gain access to a high profile building that contains very classified information. The only thing standing between you and those secrets is a keypunch security system containing the digits 1-9 that will open the door to the building. Your spy agency has provided you details about the order of the keys you need to enter:

  1. Each digit is pressed once and only once.
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  4. The sum of the first 5 digits pressed is 19; the sum of the last 5 digits pressed is 27.

As you wonder why your agency couldn't just write down the sequence for you, you crack the code and enter the building.

What sequence of keys did you press on the security system to get into the building?

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