[color=blue][i][b]given GW/ total moment index at taxi is 2700 kg/ 740[/b][/i][/color]

That's fine.

[color=blue][i][b]find the min amount of fuel to be carried as ballast in the main tanks to bring the aircraft c of g to 730 IU[/b][/i][/color]

Perhaps you might check both IU numbers, again ?

(I note that IU is not a CG so it is very careless to say [color=blue]bring the aircraft c of g to 730 IU[/color] even if we know what is meant by the words).

Thanks John... I double checked the question... and it definitely asks me to work out min fuel to be carried as ballast in main tanks to bring the aircraft centre of gravity to 730 IU....
I used the flow chart in Bob’s book ... weight to add... but I have a very different outcome to the answer given..... perhaps if I e mail you the working I did... and the answer working you could nut it out for me... I mean... what else is there to do on a Tuesday....;)

Sophie,

I'm not surprised that you experienced some confusion - the question is unsound. However, let's have a look at the working and we can identify the problems. Probably it will need Bob's/Stuart's revamping the question to make the problem go away.

Actually what does surprise me is that they have such a low rate of errors - they really do do a fine job of what they do.

That is not our question John

[color=blue][i][b]That is not our question John[/b][/i][/color]

My confusion. Apologies for the comment.

However, when Sophie posts some more detail, there will be some learning benefits for the wider student cohort.