Z Problem 3 (30%): A concrete foundation mat in the shape of a regular hexagon of side 12 ft supports four column loads as shown. Determine the magnitudes of the additional loads that must be applied at B and F if the resultant of all six loads is to pass through the center of the mat (point O). 360 6 y 20 kips 60° 15 kips 30 kips 10 kips 60€60 E 12 A F 0 B C 다 12 ft Z D 5/30