$(30)$ Problem $3.$ A differential U$-$tube

manometer is connected between tank A

and tank B as shown. You are given the

following values.

$($a$)(15$ pts$.)$ If the gage pressure in tank B

is $20$ psi $,$ what is the pressure within $tankA$

in psi?

$($b$)(15$ pts$.)$ What is the density of the gas in in $($:$k\frac{g}{m^3}\}?$ The gas in tank $B$ is air at

$)=287\frac{J}{kg.K}$;$p_a=(101,350(Pa).$