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Let numbers be a, b, c & d Now according to the question, (a + b + c + d)/4 = 75 or a + b + c + d = 300 ................ (1) a = (1/4) (b + c + d) or b + c + d = 4a .......................... (2) Putting equation (2) in equation (1), we will get a + 4a = 300 or 5a = 300 or a = 60
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