A block of iron, completely submerged under water, is suspended from one end of an equal-arm balance by a thin wire. To balance the scales, 2.55 kg...

A block of iron, completely submerged under water, is suspended from one end of an equal-arm balance by a thin wire. To balance the scales, 2.55 kg are needed on the scale pan at the other end. What is the volume of the block? (density of iron is 7.86*10^3 kg/m^3)