If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake

Pressure at half the depth  =P0+h2dgPressure at the bottom  =P0+hdgAccording to given condition P0+h2dg=23P0+hdg⇒3P0+3h2dg=2P0+2hdg⇒h=2P0dg=2×105103×10=20m