31. Adam, Brenda, and Nimai were hired to mow a neighbor's lawn. Since there was only 1 lawnmower, they agreed to divide the money received in the same proportion as the time each spent mowing the lawn. Brenda mowed 5 minutes longer than Adam, and Nimai mowed 15 minutes less than Adam. If it took the 3 of them a total of 80 minutes to mow the lawn, what percent of the money did Adam receive?