book Maths Puzzle Numerical Ability

If I know the length of two sides of a triangle, how do I find the length of the third side?

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book Other Question

An art dealer sold two artworks for $1520 thereby making a profit of 25% on the first work and 10% profit on the other, whereas if he had approached anyexhibition he would have sol Either perform the indicated operation or solve the equation, whichever is appropriate.

x^2-4/x = 4x-8/x