exam Maths Puzzle Numerical Ability

Not owning, need help...
err, its a function.
2x+y=6

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exam Other Question

How do I prove these directly, and indirectly

given:p^~(q ^ r)
p-> q
(~w v s)-> ~r
prove: q ^ ~s Can someone please tell me what a Quartile 3 is and how you find it in a problem? Thanks