Wish I Had a Watch
You have a correctly set standard wall clock (not digital), which has marks indicating the hours, but no numbers. You can only see the clock through a mirror. To complicate things, you happen to know that it was installed upside-down.
When you look in the mirror, you see that the time appears to be 7:55 (although the hour hand is just a tad off from where it's supposed to be). What is the real time?
To solve this, simply draw a standard clock on a sheet of white paper, with the time showing as 7:55. Now flip the paper over, left to right (as if you were turning the page of a book). This simulates looking in a mirror. Then rotate the paper 180 degrees to simulate the clock being upside down. Hold the paper up to the light and the time will appear to be 10:35.
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