book Maths Puzzle Numerical Ability

What is the mathematical average of the number of weeks in a year, seasons in a year, and the number of days in January? Please can I get a detailed explanation.Thanks

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If the equality x^3 = A(x - 1)(x - 2)(x - 3) + B(x - 1)(x - 2) + C(x - 2) + D is an identity, what is A + B + C + D? I need help to solve the following problem: -x-(13+4x)=-3(5-9x)+2