book Maths Puzzle Numerical Ability

3x/4=66, what does x equal?

3x/4 is suppose to be written in a fraction way, not division.

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book Other Question

Find the roots of the quadratic equations by the method of completing the square. Express the roots, if they are not rational, in simplest radical form.
Donna invested her $33,000 bonus and reieved a tatal of $970 in interest after one year. If part of the money returned 4% and the remainder 2.25% then how much did she invest at each rate?

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