exam Maths Puzzle Numerical Ability

A polygon has n sides. Four of its exterior angles are 12, 25, 32 and 41 and the remaining (n - 4) exterior angles are each equal to 50. Find n.

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The quotient of p minus q, divided by 5 5-2(y-5)=27 how do you solve and check that and could you show all steps and give a free ex. please and thank you