Leonardo decided to start training to run in a marathon to keep in shape. after 5 training sessions, he had run a total of 25 miles. leo decided to take it easy at his training session today and only run half his normal distance. how far did he run? *

Total distance ran by Leonardo in 5 training sessions = 25 miles
Then
Total distance ran by Leonardo in 1 training session = (25/5) miles
                                                                                   = 5 miles
Total distance ran by Leonardo today was half the distance he actually covers in every training session.
So
Total distance ran by Leonardo today = (5/2) miles
                                                             = 2.5 miles
So Leonardo ran for a distance of 2.5 miles today. It is actually very important to read the question carefully and then the answering the question becomes easy.

Hello!
volume of sphere =4/3.pi.r^3