Answer Posted / r_vaya

In such case vaccume will apply in both lags  equally .
Now hight is 7 ft and density 1.38

7 ft is equal to 84 inches 

So ,
84 X 1.38 = 115.92 inches of H2O became our span.

1 inches of H2O = 1.87 mmHg

Thus,
115.92 inches H2O = 216mmHg

tank is closed thats why ,

LRV  =    - 216 mmHg
URV =      0 mmHg

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