Algebra
posted by Brandon .
The numerator of a certain fraction is 3 times the denominator. If the numerator is decreased by 1 and the denomenator is increased by 2, the value of the resulting fraction is 5/2. Find the fraction.

N=3D and
(N1)/(D+2)=5/2
or 2N2=5D+10 or
2N=5D+12
solve. 
3 hahaha!

The numerator of a certain fraction is 4 times the denominator. If 12 is added to both the numerator and the denominator, the resulting fraction is equivalent to 2. What was the original fraction.