If the numerator of a fraction is decreased by 20% and the denominator of the same fraction is increased by 30%, then what fraction of the old is the new fraction ?
Solution -let the fraction = x/y
Decrease by 20% in numerator and increase by 30% in denominator.
=(x×80/100)/(y×130/100)
=8x/13y
fraction of the old is the new fraction=(8x/13y) ×y/x
=8/13.
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