Posted by Zac on .
The denominator of a fraction is four more than twice the numerator. If both numerator and denominator are increased by six, the simplified result is 7/13. Find the original fraction

Math 
Steve,
original fraction: n/(2n+4)
modified fraction:
(n+6)/(2n+4+6) = 7/13
13(n+6) = 7(2n+10)
13n+78 = 14n+70
n = 8
n=8
So, the original fraction was 8/20
and the new value is 14/26 = 7/13