How To Do Addition Using 2 RS Values?

The problem i am having is adding 2 rs values to each other to come up with an amount.

so i have something like the following:

sql1 = "select sum(col1 + col2 + col3) as result1 from table where col4 = "y" "
set RS1 = Conn.Execute(SQL1)
pastdue1 = formatnumber(rs1("result2"))

sql2 = "select sum(col1 + col2 + col3) as result2 from table2 where col4 = "y" "
set RS2 = Conn.Execute(SQL1)
pastdue2 = formatnumber(rs2("result2"))

pastduefinal = (pastdue1 + pastdue2)

But when i do a response.write (pastduefinal) i get "0.000.00"
Does anyone have any idea? I replaced the formatnumber with formatcurrency but still didnt work. Am I using the addition incorrect?