book Maths Puzzle Numerical Ability

Solve for x

x=(.31429x)+24000

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book Other Question

HOW IS THIS DONE?

WHAT IS THE SLOPE OF A LINE THAT IS PERPENDICULAR TO THE LINE PASSING THROUGH THE POINTS (8,3) AND (10,6)?
Dear Sir/Madam,

Recently, I am studying software testing. I manually obtain some test constraints from a program. These constraints are composed of a set of equations or ine