The ratio of specific gravities of A to B is

Question

In a differential manometer, a head of 0.5 m of fluid A is limb 1 is found to balance a head of 0.3 m of fluid B in limb 2. The atmospheric pressure is 760 mm of mercury. The ratio of specific gravities of A to B is                    

(a) 0.25        (b) 0.6        (c) 2            (d) 4