30. In February, Calvin's school used 4,920 pounds of rock salt to melt ice on its sidewalks. One bag contains 40 pounds of rock salt. Choose Yes or No to tell which of the following equations can be used to find how many bags of rock salt, b, Calvin's school used in February 30a. 4,920b = 40 0 Yes Ο Νο 30b. 40b = 4,920 30c. 4,920 + 40 = b 0 Yes Ο Νο 30d. 4,920 = b = 40 0 Yes Ο Νο O Yes Ο Νο​