Question: Who is the co-contestant (yaar vs. Pyaar) with Vishal Singh as the main contestant?
SQL: SELECT "Co-contestant (Yaar vs. Pyaar)" FROM "2-18278508-3" WHERE "Main contestant" = 'Vishal Singh';

Question: Who is the main contestant with scores by each individual judge of 8 + 7 + 7 = 21?
SQL: SELECT "Main contestant" FROM "2-18278508-3" WHERE "Scores by each individual judge" = '8 + 7 + 7 = 21';

Question: Who is the main contestant with a total score/week of 42/60 and a co-contestant (Yaar vs. Pyaa) of Tina Sachdev?
SQL: SELECT "Main contestant" FROM "2-18278508-3" WHERE "Total score/week" = '42/60' AND "Co-contestant (Yaar vs. Pyaar)" = 'Tina Sachdev';

Question: What is Tina Sachdev's position?
SQL: SELECT "Position" FROM "2-18278508-3" WHERE "Co-contestant (Yaar vs. Pyaar)" = 'Tina Sachdev';