Question: What were the options that were Completed before the 4 th task that had viewers selecting Nan?
SQL: SELECT "Options" FROM "2-15162503-1" WHERE "Result" = 'Completed' AND "Task No." < 4.0 AND "Viewers' selection" = 'Nan';

Question: when was it announced that the viewers selected Robi out of Alex, Ejay, Nan, Robi?
SQL: SELECT "Day announced" FROM "2-15162503-1" WHERE "Viewers' selection" = 'Robi' AND "Options" = 'Alex, Ejay, Nan, Robi';

Question: What day was it when viewers selected Ejay?
SQL: SELECT "Day announced" FROM "2-15162503-1" WHERE "Viewers' selection" = 'Ejay';