You have a glass beaker that you will use to simulate a porous and permeable reservoir rock. The internal diameter of the beaker is 7.6-centimeters and its height is 11-centimeters. You fill the beaker with as many spherical glass marbles as it will hold, making sure the marbles are level with the top of the beaker. Next, you pour water into the available void space between the marbles, noting that it requires 205-cubic centimeters of water to bring the water level to the top of the beaker. Calculate an estimate of the percentage of your simulated rock that is void space (or porosity). If it is not possible to calculate this estimate from the information given, then describe what additional information is needed