6--3=9
15-6=9,
so
24+9=33,
33+9=42,
42+9=51
33,42,51
V = l * w * h
240 = 20* h
divide both sides by 20
12 = h
height = 12 inches
<span>Assuming that this is referring to the same list of options that was posted before with this question, the correct response was the first one, although I forget what it was. </span>