Remembered it was 15.7
<FFF checks back to see what answer he put> Whew, that's a relief!
If that had come up on my exam, it would have been one that I'd have left to the end and come back to, no question at all. Whether I'd have managed to do it in the time available I don't know - I know it took me quite a while this morning, but I was doing bits of it in between bits of work, so I don't know exactly how long.
FFF
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