book Maths Puzzle Numerical Ability

The midpoint of line segment JK is M. What is the probability that a randomly selected point on line segment JK is closer to M than to J or to K?

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book Other Question

Identify all rational zeros of the polynomial function f(x)= x^3+4x^2-2x-15 The sum of two numbers is 15. Three times one of the numbers is 11 less than five times the other. Find the numbers.