book Maths Puzzle Numerical Ability

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Solve for a s=1/2(a+b+c)

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what is the property for the angle ocb=90 degees when you when you have to solve angle1+angle3=90degrees I'm having problems grasping the concept and proceedure to solving algebraic equations, I'd appreciate it if you walk me step by step through an example equation, that I may grasp