The average number of novels on historical, thriller and fantasy in a library is 160, and the average number of novels on historical and fantasy is 140. If the number novels on fantasy is 25% less than the number of novels on thriller, then what is the number of novels on historical in the library?
Let the number of novels on historical, thriller and fantasy be x, y and z respectively. Given, (x + y + z)/3 = 160 => x + y + z = 480 ….. (1) And, (x + z)/2 = 140 => x + z = 280 ….. (2) From equation 1 and 2 Number of novels on thriller = y = 200 Number of novels on fantasy = 0.75 × 200 = 150 Therefore, number of novels on historical = 480 – (200 + 150) = 130
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