keisha charlie and abdul sent a total of 79 text messages during the weekend, keisha sent 7 more messages than charlie, abdul sent 2 times as many messages as charlie. how many messages did they each send?

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