Zhang is about 22lbs heavier than Joyce.

Could have been a bit of both.

 

@cuchulain pardon my 50 grams (I neglected 50, you close it to 6.4 by 50, so we're both wrong by 50), but my comment wasn't to contradict yours, just sharing the same opinion.

Maybe it's me, but saying "one stone is just 5% (from his previous weight)" looks like you see it as nothing big.

 

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No entirely true.

IF I was giving the value of a stone in Kg to seven places, it would be 6.3502932 kg

IF I was giving it to four places, which I did in my post, then the correct value would be 6.3503 kg.

The reason I mentioned you being a wee bit off was that the correct value to ONE decimal place is 6.4 kg rather than 6.3 kg.

If you check my post, what I said was

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which is actually not wrong.

I took your comment

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as indicating that you felt that I thought a stone was a joke weight. I'm not sure why you would otherwise mention that it wasn't a joke weight. In my response, I was indicating that I was familiar with what a stone was.

In Joyce's case, a drop of one stone is a drop of 5 %.
I don't consider that very significant for a man of Joyce's size.

As I said, my weight often varies by 7 lbs over the course of a day.

And finally, I mentioned that the weight drop was not the reason he lost, a point on which we agree.