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Start learning 50% faster. Sign in nowLet the number of books on History, Polity and Geography be x, y and z respectively. Given, (x + y + z)/3 = 150 Or, x + y + z = 300 ….. (1) And, (x + z)/2 = 140 Or, x + z = 280 ….. (2) From equation 1 and 2 Number of books on polity = y = 170 Number of books on geography = 0.8 × 170 = 136 Therefore, number of books on history = 450 – (170 + 136) = 144
I. p2 +7p + 10 = 0 II. q2- q – 6 = 0
I. 81x - 117√x + 40 = 0
II. 81y - 225√y + 136 = 0
I. 3x2 - 14x + 15 = 0
II. 15y2- 34 y + 15 = 0
I. 15y2 + 4y – 4 = 0
II. 15x2 + x – 6 = 0
I. 2p2 + 25p – 13 = 0
II. 2q2 – 19q = 2q + 23
I. p2 – 15p + 56 = 0
II. q2 + 2q – 63 = 0
I. 8y2- 2y - 21 = 0
II. 2x2+ x - 6 = 0
I. 2y² - 3y – 14 = 0
II. 3x² - 7x + 4 = 0
I. x2 - 5x - 14 = 0
II. y2 - 16y + 64 = 0
I. 7x² + 27x + 18 = 0
II. 19y² - 27y + 8 = 0