cm to inches: multiply by 4, then divide by 10. 30cm is 12" -- the diameter
of an LP.
C to F: multiply by 9, divide by 5, then add 32. 20 degrees C is 68 degrees F
-- roughly "room temperature."
These are easy to do "in the head" with a bit of practice. Most of the world
uses the metric systems; 'murcans should get used to it.
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