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If the numerator of a fraction is increased by 400% and the denominator is increased by 500%, the resultant fraction is 10/21.

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If the numerator of a fraction is increased by 400% and the denominator is increased by 500%, the resultant fraction is 10/21. What was the original fraction?
(a) 5/12
(b) 8/13
(c) 17/14
(d) 4/7
(e) None of these

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(d) Let the original fraction be = x/y

According to the question,

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