In the above manometer, attached to a sample of gas, the difference in the height of the mercury levels is 28.0mm. The barometric pressure is 750.0mm Hg. What is the pressure of the gas sample in kiloPascals ?
( The above figure is not drawn to scale, but the relative heights of the right and left columns of mercury are correctly shown )
Enter a numeric answer only, no units.
I converted into :
99.992 kiloPascal, but it is incorrect. What did I do wrong? Please!!