A galvanometer gives full scale deflection with 0.006 A current. By connecting it to a $$4990 Ω$$ resistance, it can be converted into a voltmeter of range 0 - 30 V. If connected to a $$\frac{2n}{249}Ω$$ resistance, it becomes an ammeter of range 0 - 1.5 A. The value of n is