Let the number of books on History, Polity and Geography be x, y and z respectively. Given, (x + y + z)/3 = 120 Or, x + y + z = 360 ….. (1) And, (x + z)/2 = 130 Or, x + z = 260 ….. (2) From equation 1 and 2 Number of books on polity = y = 100 Number of books on geography = 0.8 × 100 = 80 Therefore, number of books on history = 360 – (100 + 80) = 180
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