<PRE><B>Question 115828</B>
C=pieD^2L/924
where 
C=capacity in gallons
D=diameter of tank in inches
L=length of tank in inches
(a) Find the diameter of a 42-in-long tank that has a capacity of 30 gallons.
(b) Find the diameter of a 60-in-long tank that has a capacity of 50 gallons.
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C=pieD^2L/924
Solve for D:
D = sqrt[924C/(pi)L]
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a) D = sqrt[924*30/[(pi)*42]
D = 21.08 inches
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b) D = sqrt[924*50/[pi*60]
D = 245.0986 inches
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Cheers,
Stan H.
</PRE>