gage pressure

Problem
In a condenser containing air and water, the air pressure is 22.1 kPa absolute. What is the gage pressure in kiloNewton per square meter at a point 1.37 m below the water surface.
 

Problem
The pressure in a gas tank is 2.75 atmospheres. Compute the pressure in kiloPascal and the pressure head in meter of water.
 

Problem
What is the pressure in pounds per square inch 4 ft below the surface of a liquid of sp. gr. 1.50 if the gas pressure on the surface is 0.4 atmosphere?