Did you solve it? Would you get into Oxbridge?

The answers to today's puzzle. Find out if you made the grade

Earlier today I set you the following puzzle, from a recent Oxford Mathematics Admissions Test. Thanks to everyone took part; more than a thousand comments below the line and several very funny threads.

And I'm very impressed - about 80 per cent of you got each question correct. Congratulations, you are all admitted into Oxford! (And next time I will make the questions more difficult.)