exam Maths Puzzle Numerical Ability

The students found that 0.016 of the teachers were either completely brave or fearless. If 480 teachers fell into one of these caegories,how many teachers were there in all?

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how are they getting 1/x-2 An isoscelenes trapezoid has one base 23 inches long, and a height of 8 inches. If the area of the trapezoid is 136 square inches, what is its perimeter?