50% of students at Harvard, MIT, and Princeton can't answer this question
businessinsider.com
businessinsider.com
It is not clear if 50% means:
(1) "50% of the total"
(2) "in each school, 50% of those asked could not answer the question".
(1) A + B = 1.1 (2) A - B = 1
(1) + (2) : 2A = 2.1 => A = 1.05 => B = 0.05.
I don't understand the fuss.
To be honest the number 10 also came up immediately for me as well, then I stopped to think 'wait, there has to be more' because of the title.
I will need to get my introspection goggles before thinking this further.