well, say you have the number 4, and you want to multiply it with 5, but you want 4 to be an unknown factor.
X x 5= 20 X=4
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unknown
The 'X' indicates that the factor is unknown.
His birthday is unknown.
If one factor is 48 and the other is unknown, divide both sides of the equation by 48. 48 x ? = 4608 ? = 96
An exact number is unknown but it's usually in the millions.