The intensity of an earthquake is rated using the Richter scale. The Richter scale rating of an earthquake of intensity x is given by R= log 10: where x, is the intensity of an earthquake of a certain small size, 4.8. Earthquake A had a Richter scale rating of 6.3, and earthquake B had a rating of 7.2. How much more powerful was the second earthquake than the first one? Earthquake B was times as powerful as the first. (Round to the nearest whole number.)

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