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When I first saw this, I hadn't seen the whole question and thought it was how to solve the quadratic equation and I gave the same answer as HKFC

No, it's 42

I think it's pretty easy too and I did my maths O level 42 years ago. Mrs Gwylan sat this paper yesterday and was pleased with herself for solving it as she heard some people moaning about it EDIT: But the topic heading is wrong - it doesn't ask you to solve that equation