x/4=y/3 x/y=4/3 (x+y)/(3x+2y) = [(x+y):y]/[(3x+2y):y]=(x/y+1)/(3x/y+2)= (4/3+1)/(3*4/3+2)= =(7/3)/(4+2) =(7/3)/6= 7/18