Please, if anyone could solve and explain to me the process of solving these two problems I would be extremely grateful. (It's not about the result, I really need to know HOW to do this, so If I can see a process of solving these problems I hope I will be able to understand it).

1) IF (b-2a)/(4a+3b)=2 (a,b!=0, 4a+3b!=0), THEN (2a^2-3ab+5b^2)/(4a^2+3b^2) EQUALS?

2) Value of the expression (25^(0,3)*5^(0,4))/12^(-1/3) belongs to the interval (which)?