In a study of US rivers 693905 miles of river were studied A

In a study of US rivers, 693,905 miles of river were studied. According to the U.S. Environmental Protection Agency, it was found that 36% of the total miles of river studied had impaired water quality.

How many mile of rivers had impaired water quality?

Solution

note that 0.36*( 693,905) = 249805.8 ~= 249806

Hence 249806 miles of rivers had impaired water quality.