<image>After completing 380 class hours of teaching middle school mathematics, Teacher Tang plans to arrange 60 class hours for a general review. Based on the proportion of class hours occupied by different mathematics content, the following statistical charts have been drawn (Figures 1 to 3). Please answer the following questions based on the information provided in the charts:  (1) The central angle of the sector representing "Statistics and Probability" in Figure 1 is __ degrees; (2) In Figures 2 and 3, a = __, b = __; (3) How many class hours should Teacher Tang allocate to review the "Numbers and Algebra" content in the 60 class hours of general review?