Question 190428
Ok, you've got the formula in which Q = volume and m = pressure, and k, of course, is the constant of variation. 
You are given that a volume of gas under a pressure (m) of 20 pounds per cu.cm occupies a volume (Q) of 123 cu.cm of gas.  Using these values, you can find the value of k in the formula:
{{{Q = k/m}}} Substitute Q = 123 and m = 20.
{{{123 = k/20}}} so that...
{{{k = 20(123)}}}
{{{k = 2460}}} Now the formula looks like this:
{{{Q = 2460/m}}} Substitute m = 24 pounds per cu.cm. to find the volume Q.
{{{Q = 2460/24}}}
{{{highlight(Q = 102.5)}}}cu.cm.