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Answer : Explanation : We can make an equation:3(100000 x) = 10x 1(Why? Well, adding 100000 puts a 1 at the front of a five-digit number, and multiplying by 10 and adding 1 puts a 1 at the end of a number)Solving this gives:10x 1 = 3(100000 x) 10x 1 = 300000 3x 10x = 299999 3x7x = 299999x = 299999/7 = 42857The answer is 42857 (142857 is three times smaller than 428571).

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