Question

Two stretched membranes of area and are held horizontally in a liquid, at the same depth. The ratio of pressure on them is_____:

Answer 1

pressure at the depth, h in liquid is given by,
$P=P_0+\rho gh$
where P is the pressure at the depth ‘h’ , $\rho$ is density of liquid , g is acceleration due to gravity , $P_0$ is atmospheric pressure and h is depth from the sea level.

here you can see that pressure at the depth doesn't depend on area. while it is directly proportional to depth.

in question, depth is same in both membranes
so, the ratio of pressure on them is 1 : 1

Answer 2

Pressure underwater = hdg

Pressure is the force acting per unit area ,hence Pressure is independent of area of cross section.Therefore , since both them membranes are at the same horizontal level in the liquid ,pressure acting on them will be the same Hence 1:1  

I hope you have understood fam ;-)