Which age group of this set of numbers has twice as many people as another age group? A. 76–85
B. 15–25
C. 36–45
D. 46–55

Pls answer fast

David and alton are training for a race. they spend 35 minutes stretching and then go on a 5 mile practice run. david runs at a pace of 7 min/mile. alton runs at a pace of 8 min/mile. write an equation for each runner that shows the total length of their workout. then solve each equation showing your work