book Maths Puzzle Numerical Ability

ONE NUMBER IS 4 TIMES ANOTHER. THE SUM OF THEIR RECIPROCALS IS 5? cAN SOMEONE HELP WITH THIS?

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book Other Question

How do I find the range and domain of y=4x+7? What conditions exist when two inequalities have no solution? I know that the discriminant determines the solution for quadratic equations, but is the same true for inequalities?