How atomic weight, valency, eq.weight of a metal related ?

A , E, M , and n are the atomic weight equivalent weight , molecular weight and valence of an element . The correct relation is :

Salts of A (atomic weight 7), B (atomic weight 27) and C (atomic weight 48) were electrolysed under identical condition using the same quantity of electricity. It was found that when 2.1 g of A was deposited, the eight of B and C deposited were 2.7 and 7.2 g. The valencies of A,B and C are respectively :

An electric current of c ampere was passed through a solution of an electrolyte for t second depositing P g of the metal M on the cathode. The equivalent weight E of the metal will be :

A current of 9.65 ampere folwing for 10 minute depostits 3.0 g of a metal. The equivalent weight of the metal is :

What is the equivalent weight of sodium ?