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https://www.theguardian.com/science/2020/oct/19/can-you-solve-it-the-bat-the-ball-and-the-bamboozle
Shirley they can't all have got it wrong.
Crazy
the interest rate one is tricky - answer appears to be 41.3% (ish)
These things pop in to my life every now and then and I always raise my eyebrows. Generally speaking if I realise its 'one of those tricks' I could concentrate and do better, but I can't normally be bothered. If I was at Harvard (massively unlikely unless I was cleaning the loos) and someone had asked me over lunch I would probably have got most of them wrong until I got frustrated and started to think harder.....
TBH even with a pen and paper, I reckon I'd not get 6/6.
Also, it doesn't say what subject they were reading. I'd expect the mathematicians to get them, history of art and philosophy undergrads I'd expect a nice doodle and a thesis on why the ball felt undervalued.