Question

Denominator of a rational no. 4 more than its numerator. If we add 3 to numerator and denominator then it become 1/2.Find the original no.

Answer 1

let numerator be x. then denominator is x+4 .by adding 3 to numerator and denominator we get x+3 and x+8 . then x+3/x+8=1/2. now find the value of x.
2(x+3)=x+8
2x+6=x+8
2x-x=8-6
x=3

Answer 2

let the numerator be x
then denominator = x+4
x+3/x+4+3 = 1/2
x+3/x+7= 1/2
2x+6 = x+7
x = 1
the number is 1/5