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Volume of cuboid = Area of base x height
= 160 x 12 cu cm
= 1920 cu cm
New volume after immersion of spheres = 160 x (12+2) cu cm
= 160 x 14 cu cm
= 2240 cu cm
Volume of 3 spheres = Change in volume
= (2240 1920) cu cm
= 320 cu cm
Volume of 1 sphere =
Radius of each sphere = 2.94 cm