A certain superconducting magnet in the form of a solenoid of length 0.30 m can generate a magnetic field of..?

A certain superconducting magnet in the form of a solenoid of length 0.30 m can generate a magnetic field of 8.0 T in its core when its coils carry a current of 85 A. The windings, made of a niobium-titanium alloy, must be cooled to 4.2 K. Find the number of turns in the solenoid.