When the current in a toroidal solenoid is changing

at a rate of $0\mathrm{.}0260$A$/$s$,$ the magnitude of the

induced emf is $13\mathrm{.}0$ mV $.$ When the current equals

$1\mathrm{.}50$ A $,$ the average flux through each turn of the

solenoid is $0\mathrm{.}00278$ Wb $.$ How many turns does the solenoid have?