book Maths Puzzle Numerical Ability

The diagonal distance of a flatscreen television is 48 inches, what is the height of the tele screen?

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In any triangle, the sum of the measures of the angles is 180 degrees. In triangle ABC, angle A is 4 times as large as angle B. Angle C measures 20 degrees less than angle B. Find the measure of each angle. How can you solve an equations with one variable and two numbers if they have a neggative and positive signs.It will be oky if you give me an example of how to solve an equation.If it`s not a problem if you could show step by step please and thank you.