If 1 is added to the denominator of a fraction, the fraction becomes 12. If 1 is added to the numerator of the fraction. the fraction becomes 1. Then the fraction is
34
45
12
23
A
34
B
45
C
12
D
23
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Solution
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The correct option is D23 Let the numerator be n and the denominator be d. Then nd+2=12 ........... (1) or 2n=d+1 n+1d=1 or n+1=d ............(2) Substituting for d in equation (1), we get 2n=n+1+1 or 2n−n=2 or n=2 ∴d=n+1=2+1=3 Hence, nd=23
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