How Does Installing Equipment and a New Seat Affect an Aircraft's Balance?

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A 5lb Piece of equipment is installed on a aircraft on a Aircraft 45 inches aft of the C of G. A new Seat is also fitted 60 inches fwd of the C of G, Weighing 3.5 lbs more than the old seat. What is the resultant moment?

I Know its 60-45=15

Im not sure do i have to use the weight for anything? or they asking for more than i need?

the resulant moment is -15 i think.

Still behind the datum.
 
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Since when is 5 lbs. = 3.5 lbs.? This is a simple moment calculation (Hint: think see-saw.)
 
Not sure what You mean... Its a Aircraft not a See saw. Its trying to find the Negative and Positive weight to the C of G. its either -15 or +1.25 Ibs...