1) 2 49/72 * 15 - 25 7/12 = 193/72 * 15 - 307/12 = 965/24 - 614/24 = 351/24 = 14 5/8
2) 24 13/16 + 8 3/4 * 11 = 397/16 + 385/4 = 397/16 + 1540/16 = 1937/16 = 121 1/16
3) 5 11/20 * 8 + 6 3/10 = 444/10 + 63/10 = 507/10 = 50 7/10
4) 7 83/90 * 27 - 156 4/15 = 2139/10 - 2344/15 = 6417/30 - 4688/30 = 1729/30 = 57 19/30