Question

The Northridge, California, earthquake of 1994 had a magnitude of 6.8 on the Richter scale. A year later, a 7.2-magnitude earthquake struck Kobe, Japan. How many times more intense was the Kobe earthquake than the Northridge earthquake?

Answer 1

one approach
set up the ratio to let the Northridge earthquake be equivalent to 1 unit
6.8 to 7.2 we need 1 to how many times more intense, x
divide each side by 6.8
6.8/6.8 = 7.2/6.8
1: 1.05