A block of metal which weighs 60 newtons in air and 40 newtons

Question

under water has a density, in kilograms per meter cubed, of:

Answer 1

buoyant force = 20N = rhowater g V = 9800 V
so
V = 20/9800

mass = 60/g = 60/9.8

so rho metal = mass/volume = (60/9.8) / (20/9800)= 3000 kg/m^3 or three times the density of water

Answer 2

3000

Answer 3

Explain it extensively