IF you didn't take into account the MRJT from CAP696/7 and just worked with the given figures then 13092 is the maximum traffic load, but not the clearest question ever produced. Would be better saying "an aircraft" with no reference to MRJT.
20100 * .78 = 15678 kg total fuel - 250 taxi = 15428 kg T/O - 9250 kg trip = 6178 kg on landing.
67200 - 34930 - 15428 = 16842 maximum T/L at take off.
54200 - 34930 - 6178 = 13092 maximum T/L for landing.
Unless the question says "refer to CAP696/7" then I suggest you go with the raw data provided however poor it might be.
Last edited by RichardH; 16th Dec 2012 at 19:55.