book Maths Puzzle Numerical Ability

Find the coordinates of the midpoint of a segment with each pair of endpoints.
I(0, -2), J(3/4, 5)

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book Other Question
graph g(x)= 5/(x+2)(x-1) If a,b, and c are consective positive integers, show that (6/5)<= (a/(b+c)) + (b/(a+c)) + (c/(a+b)) <= 2