Question 746756
B=2A-15
C>A

and A+B+C=180

which becomes...

A+(2A-15)+C=180

C=180+15-3A

C=165-3A


so

{{{0<A<55}}}

Which sets our boundary to test for valid triangles. After trial and error (there's probably a better way) we can deduce the following.

The least value for C under these conditions is C=42 and the greatest is a little more than 142

so...these are pretty good approximations
{{{8<A<41}}}
{{{42<C<142}}}