exam Maths Puzzle Numerical Ability

Need answer to the following problem:
f(x) = -absolute value of x; D:{-5, -3, 0, 3, 5}

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exam Other Question

While working for a construction company, you realize that the cost of building a high-rise apartment varies from floor to floor according to an arthimetic progression. You calcula one third of a three-digit number whose units digit is x, ten digit is 5 and hundreds digit is three times the units digit