Respuesta :
First we should find the percent that this number of miles are currently at:
20n = 11
n = 11/20
n = 0.55
1 - 0.55 = 0.45
A 45% decrease
20n = 11
n = 11/20
n = 0.55
1 - 0.55 = 0.45
A 45% decrease
The answer is 45%. The miles went down 9 miles, so you do 9/20, or 45%