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Broken Calculator II (Posted on 2013-07-31) Difficulty: 2 of 5
A broken calculator has only the keys:
+(addition), -(subtraction), /(division), x(multiplication), =(equals)
It is a simple calculator that can do one binary operation at a time.
The only functional digit is 7.

How is it possible for 34 to appear in the readout in the fewest number of keystrokes?


1. Performing as many operations as possible is allowed.

2. The digit 7 may be reused, that is expressions like 777x77 or, 7777+7 in a given operation is allowed.

No Solution Yet Submitted by K Sengupta    
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Comments: ( Back to comment list | You must be logged in to post comments.)
Solution possible solution | Comment 2 of 3 |
10 keystrokes

First operation, 6 keystrokes: 777/7=
result: 111
Second operation, 4 additional keystrokes -77 =
result: 34

  Posted by Dej Mar on 2013-07-31 12:21:01
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