In which case will the electric flux be greater if two different spheres with two separate charges q and 20q are placed inside them?

The charge bound inside a sphere is directly proportional to the electric field line. And also, electric flux can be measured using the field lines, i.e. electric flux is known as the number of field lines crossing through a particular surface. Hence, the flux will be 20 times more in the case of a 20q charge and less in the case of a q charge.