book Maths Puzzle Numerical Ability

an earthquake has intensity of 300,00,000 times the reference intensity (Io) what is the earthquaks measure on the richter scale

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book Other Question

The sum of a number and 4 times its reciprocal is 25 over 6...

equation is: X+4(1/X)+25/6... but how do I solve this?

Thank you! solve the polynominal equation 3x^4=6x^2 by factoring