It stands for watt-hour. In relationship to batteries, it measures how many watts in an hour a battery can sustain. A 63 watt-hour battery will supply 63 watts for 1 hour, or 6.3 watts for 10 hours or 31.5 watts for 2 hours, etc. It is extremely difficult to determine, from this number, how long your equipment (say, a laptop) will run using a 63 hour battery. The thing for which this number is most useful is battery comparison. A 20 WHr battery will last twice as long as a 10 WHr battery and half as long as a 40 WHr battery and so on.
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If you mean 18, 27 and 63 then the GCF is 9
If you mean lcm, it is 36 because 9 x 4 equals 36 and 3 x 12 equals 36.
The GCF is: 63
GCF(189, 441, 63) = 21.
63 is 48% of 131.25