Question 398445
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Hi
The sum of its numerator and denominator is 105
Let x and (105-x)represent the numerator and denominator respectively
Question states***
{{{ x /(105-x) = 2/3 }}}  |cross multiplying to solve for x
 3x = 2(105-x)
 3x = 210 - 2x
 5x = 210
  x = 42, the numerator.  The denominator is 63.   (105-42)

CHECKING our Answer***
  42/63 = 2/3