Question 1197103
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The volume (V) of a gas varies inversely as the pressure (P) on the gas. 
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{{{V=k/P}}} for some variation constant, k.


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If the volume of a gas is 12 ft3 when the pressure is 13 lb/ft2, 
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{{{VP=k}}}
{{{k=VP}}}
{{{k=12*13}}}
{{{k=156}}}
{{{k=156}}}


{{{highlight(V=156/P)}}}--------the specific formula


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find the volume of the gas when the pressure is 4 lb/ft2.
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You know what to do.