AP EAPCET 25-Aug-2021 Shift 1 Paper

Salts of A,B and C were electrolyzed under identical conditions using the same quantity of electricity. It was found that when 2.1g of A was deposited. The weights of B and C deposited were 2.7g and 9.6 g respectively. If the atomic mass of A,B and C respectively are 7,27 and 64 , then the valancies of A,B and C respectively are _______