Question 380531
Here is the master formula, 
{{{(ax+b)/(cx+d)+(ex+f)/(gx+h)}}}
Now you can pick values for a,b,c,d,e,f,g,h to get 10 different problems.
Example:{{{a=c=e=g=1}}},{{{b=2}}},{{{d=4}}},{{{f=3}}},{{{h=5}}}
{{{(x+2)/(x+4)+(x+3)/(x+5)}}}