Who are ? Write their formula using the first term (let's say ) and the ration (q), then you'll have a system of equations in two unknowns.
I suppose are, respectively, the sum of first 5,9 and 10 terms--right?
If this is the case and first term= , ratio= , then the sum of the GP series upto first terms will be
So your first equation reduces to and second equation reduces to
Solve these two equations to get and .