There are a total 70 ladies who watch at least one of the channels i.e., Zee TV. Sony TV and Star Plus. The total number of ladies who watch Zee or sonly but not star plus, the number of ladies who watch Sony or star plus butnot Zee and the number of ladies who watch star plus or Zee but not Sony is 90. how many ladies watch at least two of these channels if 10 ladies watch all the three chanels?