Between 20 and 28 students signed up for the chess club. the students could not be divided exactly into groups of 2,3,4 or 5. how many students signed up for the chess club? show your work.

The equation m = 19.32v can be used to find the mass m in grams of a pure gold coin with volume v in cubic centimeters. carl has a coin with a mass of 37.8 grams. the coun's volume is 2.1 cubic centimeters. could the coin be pure gold? explain your reasoning. whoever answers this correctly gets marked brainliest! this is also worth a decent amount of points than normal questions!