exam Maths Puzzle Numerical Ability

Ace bought a jacket for $36. This was a reduction in price of 21%. What was the price of the jacket?

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I give it a shot 3sqrtx-5=3 how would I figure this out and how would I submit this into the solver. Please advise

Thank you. If an earthquake measured 5.9 on the richter scale, what was the intensity of the earthquake? Neeed to use the formula M=log(A/Ao).