kamal obtained 81 , 68 , 82 , 69 and 90 marks ( out of 100 ) in english , mathematics , physics , chemistry and biology . what are his average marks ?
"sol . average = 81 + 68 + 82 + 69 + 90 / 5 ) = ( 390 / 5 ) = 78 . answer e"
divide(add(add(add(add(81, 68), 82), 69), 90), add(const_1, const_4))