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The sum of the numerator and the denominator of a fraction is 11. If 1 is added to the numerator and 2 is subtracted from the denominator, it becomes 23\frac{2}{3}. The fraction is:

Solution

Correct Option: 3

Let fraction be y/xy/x with x+y=11x + y = 11 and (y+1)/(x2)=2/3(y+1)/(x-2) = 2/3.

3(y+1)=2(x2)3y+3=2x42x3y=73(y+1) = 2(x-2) \Rightarrow 3y + 3 = 2x - 4 \Rightarrow 2x - 3y = 7.

Substituting x=11yx = 11 - y: 2(11y)3y=7225y=7y=32(11-y) - 3y = 7 \Rightarrow 22 - 5y = 7 \Rightarrow y = 3, x=8x = 8.

Fraction =3/8= 3/8.

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