7 stone workers time 7.00 to 12.00 installing

       3 pcs dr3
       4 pcs ee4
       7 pcs z
       1 pcs  z1
       1 pcs z2
       5 pcs mm3

Material used by stone:
        Beginning balance:    27 bags
        Used:                            3  bags
        Ending balance:         24 bags