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ATQ,
Let 10th number is ‘x’ So, 12th number = 1.8 × x + 34.3 And, 11th number = x + 119.5 So, x + 1.8x + 34.3 + x + 119.5 = 18 × 75 – 9 × 62.5 – 6 × 82.5 = 292.5 Or, 3.8x = 138.7 Or, x = 36.5 So, 11th number = 36.5 + 119.5 = 156