70% of the items at Flour and Fun bakery are gluten free. If there are 21 gluten-free items, how many items does Flour and Fun bakery sell? help plz

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