According to her running log, Shivani averaged 3.2 miles per week last month and 2.8 miles per week this month. By what percent has her average decreased?

Answer 1

First, we need to find the difference between the two averages: 3.2 miles/week - 2.8 miles/week = <<3.2-2.8=0.4>>0.4 miles/week
Then we divide the difference by the original average and multiply by 100% to find the percent decrease: 0.4 miles/week / 3.2 miles/week * 100% = 0.125 * 100% = 12.5%. Answer: \boxed{12.5}.

Answer 2

whole answer