A fraction becomes 4 when I is added to both the numerator and denominator and it becomes 7 when 1 i...........

Quantitative Aptitude ( CCS) Number System

A fraction becomes 4 when I is added to both the numerator and denominator, and it becomes 7 when 1 is subtracted from both the numerator and denominator. The numerator of the given fraction is

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Explanation:

Let the fraction be xy
Therefore, x+1y+1=4 ...(1)
Therefore, x+1= 4(y+1)
x−1y−1 = 7 ...(2)
x−1= 7(y−1)
Therefore, x−7y = 6...(4)
x−4y = 3 ...(3)
x−7y = −6 ...(4)
solving, subtracting 3y=9, y=3
put the value of y in (3), we get x−12 = 3,