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Let the required number be N, From question, (54 - N) / (71 - N) = (75 - N) / (99 - N) ⇒ (54 - N) x (99 - N) = (75 - N) x (71 - N) ⇒ N2 - 153N + 5346 = N2 - 146N + 5325 ⇒ 7N = 21∴ N = 3
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