SAT数学题求翻译及完整解题步骤
Arectangulartabletopconsistsofapieceoflaminatedwoodborderedbyathinmetalstripalongitsfouredges.Thesurfaceareaofthetabletopisxsquarefeet,andthetotallengthofthestripbeforeitwasattachedwasxfeet.Ifthetableis3feetwide,whatisitsapproximatelength,infeet?