1. TAS= 433-12=421kts (corrected for ISA-12º)

2. NAM = TAS x time = 421 x (29/60) = 203 NAM
3. From the table,

 Start mass = 54100kg corresponds to 3929 NAM .... (3929 - 203) = 3726NAM

 3726 NAM corresponds to mass 53000kg (end mass)

 Fuel = (Start mass - end mass) = 1100kg

 ISA -12º, so -0.7% x 1100 = -8kg,  Fuel required 1092kg.

 Answer 1100kg