Unfortunately there was only one beer in the fridge. But there’s a sneaky bottle of single malt on the shelf next to the fridge…
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You’re on fire, Don. Well played 
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While there were two beers in our fridge, the first one was already too much for this teaser. I think I’ll address the second beer now and the teaser tomorrow.
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Now there’s a man-with-a-plan and his priorities in the correct order 
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… I should have pointed out that you weigh all 55 extracted bars together, ie a single weighing as per the teaser …
(Fortunately, Cluffy knew what I meant)
6, 11 & 13
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Very well spotted n-lot.
Apparently only 2% of people are able to spot this one, so well done!
Mrs R doesn’t play pool and said that I was being mean when I explained the solution given so far. She came up with a neat alternative solution though.
She has an MSc with Merit in Maths, but don’t let that put anyone off.
Can anyone figure it out?
move the first plus sign by 45 degrees to make it a multiply sign, then put 5 x 3 + 15 = 30
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Steve, that’s very creative. If we can turn the balls around then why not the + sign, nice!
Mrs R had a different approach. I won’t reveal it just yet, let’s see if there are any other inspirational solutions.
Are we still in Base 10 ?
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15, 9 and 7, in base 11?
Engineering degree, but 100% on School Certificate maths…
Don - Mrs R’s exact words were: “it doesn’t have to be base 10”, so you are on the same wavelength.
Mike - that’s almost there but is one short. I also had that answer but scrubbed it when Mrs R checked my workings.
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Bass numbers isn’t my best area of maths…
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Anyway, a green pool ball is number 6…
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Or spelling? 
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Mike, try Base 13 using 5 + 13 + 15
Its not as easy as working in Base 8 (milk), 10 (usual) or 12 (shillings etc) and I haven’t checked it with pencil and paper.
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Mike, as far as I can tell, another combination works in Base 13.
7 + 11 + 15
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