what is grid when times/retired oils pressure and lap more than 50?
Driver Constructor Laps Time/Retired Grid
1971 French Grand Prix
1122492
text text real text real
2-1122492-1
Classification
Classification
Jackie Stewart Tyrrell - Ford 55 1:46:42.3 1
François Cevert Tyrrell - Ford 55 + 28.12 7
Emerson Fittipaldi Lotus - Ford 55 + 34.07 17
Jo Siffert BRM 55 + 37.17 6
Chris Amon Matra 55 + 41.08 9
Reine Wisell Lotus - Ford 55 + 1:16.02 15
Jean-Pierre Beltoise Matra 55 + 1:16.93 8
John Surtees Surtees - Ford 55 + 1:24.91 13
Peter Gethin McLaren - Ford 54 + 1 Lap 19
Howden Ganley BRM 54 + 1 Lap 16
Rolf Stommelen Surtees - Ford 53 + 2 Laps 10
Tim Schenken Brabham - Ford 50 Oil Pressure 14
François Mazet March - Ford 50 + 5 Laps 23
Max Jean March - Ford 46 Not Classified 22
Henri Pescarolo March - Ford 45 Gearbox 18
Graham Hill Brabham - Ford 34 Oil Pipe 4
Andrea de Adamich March - Alfa Romeo 31 Engine 20
Pedro Rodríguez BRM 27 Ignition 5
Clay Regazzoni Ferrari 20 Accident 2
Ronnie Peterson March - Alfa Romeo 19 Engine 12
Denny Hulme McLaren - Ford 16 Ignition 11
Jacky Ickx Ferrari 4 Engine 3
Alex Soler-Roig March - Ford 4 Fuel Pump 21
SELECT AVG Grid FROM table WHERE Time/Retired = oil pressure AND Laps > 50
oil pressure 50