I have solved it but I think the paper has a mistake. It is about moving back a certain number of places. But the last letter (E changing to S) threw me into confusion. I think the statement PLANTS=FAXAFE is WRONG. It should have been PLANTS=FAXAFD.
What do you think?
Completely agree. D is the logical sequence leading up to that, and E is wrong.
Is there some significance that it is in 'blocks' of numbers/letters do you think?
The blocks of letters and numbers are there to help you count back and forth in fives and tens, and then count from there.
Try question 30. It is sure to bring on a massive headache
As these are apparently paid-for sample papers I don't want to encourage anyone to publish further details, but if you want to PM me Question 30 to look at I will happily do so.
It surely can't be more terrifying than this one - I've never seen anything quite like it.