Consider a spherical closed surface containing some protons

Question

Solve the given parts of following question:

Question: Consider a spherical closed surface, containing some protons. the total electric flux through the surface is 7 x 10-5 Nm²/C.

Part A: How many protons are inside the surface?

Part B: Where are the protons located? Options are: uniformly spread throughout the sphere, no way to tell from the information given, at the center of the sphere, uniformly spread just inside the sphere.

Please explain the equations and steps are used to get the answer. Thanks!