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ATQ, Let the numbers be a, b, c, and d. According to the question, (b + 2) – (a + 1) = (c + 6) – (b + 2) Or, 2b = a + c + 3…… (1) Also, (c + 6) – (b + 2) = (d + 5) – (c + 6) Or, 2c = b + d – 5…… (2) Let a = x Then, b = x + 3 From (1), c = x + 5 And, from (2), d = x + 11 According to the question, (x + x + 3 + x + 5 + x + 11) = 28 Or, 4x + 19 = 28 Or, 4x = 9 Or, x = 2.25 Therefore, average of the last three numbers = (x + 3 + x + 5 + x + 11)/3 = (2.25 + 3 + 2.25 + 5 + 2.25 + 11)/3 = 25.5/3 = 8.5
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