Superfoods in maths

A mathematical problem with plums by the Czech team 
In the autumn I got a basket full of plums.We ate them raw (yummy!), we had them in fruit dumplings (delicious!)and we also dried them in a drier.We took a lot of photos and you can get a lot of information if you look at them carefully.On the scale there is always the same number of plums.So can you count and tell us:
a) How much does one plum stone weigh?
b) To how many per cent got the weight reduced when they were dried?

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