Answer
$2*10^{5}$
Work Step by Step
$P1*V=n1*R*T1$
$P2*4V=n2*R*T2$
$P*V=n1'*R*T1$
$P*4V=n2'*R*T2$
$n1+n2=n1'+n2'$
then we got $P=2*10^{5}$
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