exam Maths Puzzle Numerical Ability

sum of interior angles of a polygon with 5 sides
sum of interior angles of a polygon with 10 sides
sum of interior angles of a polygon with 4 sides
sum of interior angles of a polygon with 7 sides

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please help me to solve this word problem: if x is the first of four consecutive even integers, write their sum as an algebraic expression in x. Mr.Malone must custom mix a fertilizer for his field. A solution of 55% fertilizer is to be mixed with a solution of 44% fertilizer to form 22 liters of a 47% solution. How much of