This is a 3-step question
step1. 56000-1100 54900kg = TAS 437kt
-5degrees =TAS 432kt
step2. No distance given so NAM =
TAS*TIME:60 = 346NAM
step3. From the table
Startmass -----> Range
54900 -----> 3736 (subtract NAM
346) = 3390
3390 on the table gives around 52900
(interpolate) = Endmass
Startmass-Endmass = 54900-52900= 2000kg
Answer varies, depends how accurate
you interpolate!!!!!
so: 3390 look this up on the table,
then closest you will find is 3395 , so now (interpolate) to get around 52900
so: 2030 (or my answer 2000) comes from
subtracting Endmass from Startmass!!
You have to apply the ISA -5 , so is -0.3% , but this won't change the answer to
much!!!