exam Maths Puzzle Numerical Ability

Points R,S and T are collinear, with point S between points R and T. if RT= 30, and ST= 2x+4, what is the possible range of values for x?

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exam Other Question

find the midpoint between these two points
(1,-6) and (-5, -2) In a large class, 80 students took a test. When the test papers were rated, it was found that 10% of the students had A papers, 23% had B papers, 30% had C papers, 15% had D papers, and the rest failed. How many students failed the test?