sk sahu (anonymous) doubts changed status

A SPHERICAL MASS IF 20 KG LYING ON THE EARTH SURFACE IS ATTRACTED BY ANOTHER SPHERICAL MASS OF 250 KG WITH A FORCE EQUAL TO THE 25X9.8X10 to the power 8 .THECENTRE OF THE 2 MASSES ARE 30 CM APART. CALCULATE THE MASS OF THE EARTH. (GIVEN RADIUS OF EARTH=6X10 to the power 6 M)