Two volunteer groups plant trees. Group A plants the trees in clusters of 11. Group B plants the trees in clusters of 6. Both groups plant the same number of trees. What is the least number of clusters that Group A plants? Group A plants at least clusters of 11 trees

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters