book Maths Puzzle Numerical Ability

please help me to find the value of "a" in the equation (5)/(a+3)=(3)/(a-2)

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book Other Question

What is the y-coordinate of the center of the circle that passes through (-1,2),
(3,2), and (5,4)? DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0