We know that pressure acting on a body is given by, P=FA
(i) For the first cube, F=6 N and surface area, A=1 m2
Therefore, the pressure acting on the first cube is, P=FA=61=6 Pa
(ii) For the second cube, F=6 N and surface area, A=2 m2
Pressure, P=FA=62=3 Pa
(iii) For the third cube, F=6 N and surface area, A=3 m2
Pressure, P=FA=63=2 Pa