Question 449630
The denominator of a rational number is five more than the numerator. 
d = n + 5
:
if three is added to both numerator and denominator the number becomes 1/2.
{{{(n+3)/(d+3)}}} = {{{1/2}}}
Cross multiply
2(n+3) = d + 3
2n + 6 = d + 3
2n = d + 3 - 6
2n = d - 3
Replace d with (n+5)
2n = (n+5) - 3
2n - n = 5 - 3
n = 2
then
d = 2+5
d = 7
:
{{{2/7}}} is the number
:
:
Check this, if you add 3 to both numerator and denominator 5/10 = 1/2