## Interview Question: Crazy Roman Math

Sample Question #36 (brainteaser)

(The interviewer writes down the following equation on the whiteboard…)

XI + I = X

This is an equation expressed in Roman numerals. Imagine this equation is actually written out using sticks. Without touching or adding any stick, how can you make this equation true?

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### 6 Responses to Interview Question: Crazy Roman Math

1. ChrisPS3 says:

Are the sticks metal sticks? I can use a magnet, right?

2. Brett says:

Nice try, Chris. 🙂  Those sticks are wooden sticks.  More generally, you cannot move any stick (but this last condition is really a hint!).

3. quant says:

move one stick to change XI to IX, which reads 9+1=10. Don’t understand the "cannot move" or "without touching" …

4. quant says:

or, one could look at the equation upside-down, when it reads 10=9+1

5. Anil Kumar says:

XI = I + X ; atleast we can move other stuff around

6. Brett says: