book Maths Puzzle Numerical Ability

how do I figure out this type of problem 4 is what percent of 5?

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I wanted to know how to solve x-1 is less than or equal to 2x+4 which is less than or equal to 3x-1. Thank you How many X-intercepts does the parabola have? Does its vertex lie above below or on the X-axis?

Can some help me solve?

Y=-X^2+2X-1