exam Maths Puzzle Numerical Ability

find the number of sides of a regular polygon in which each exterior angles measures 168.

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exam Other Question

Translate "the sum of six and twice a number is one less than the number" in an equation and solve. question 1: use matrix method to solve
2x+3y = 11
7x-2y = 1

question 2: use method of determinant to solve
7x-2y = 23
5x-3y =