Question

An earthquake measuring 6.4 on the Richter scale struck Japan in July 2007, causing extensive damage. Earlier that year, a minor earthquake measuring 3.1 on the Richter scale was felt in parts of Pennsylvania. How many times more intense was the Japanese earthquake than the Pennsylvania earthquake? (Round your answer to the nearest whole number.)

Answer 1

I am afraid that it gonna shock you.. but 1.0 on this scale is 10 times more intensive. It's not linear function
You have to take your Cassio calculator and ...
1 divided by ln(0.4) equals about 2.5

So choose last answer

Answer 2

The answer is: 3.3
After round off: 3