The nature center has a fish tank
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See attachment for one such shell. The volume is given by the sum of infinitely many thin shells like this, each with radius 
and height determined by the vertical distance between the upper blue curve and the lower orange curve for any given , i.e. 
.
The volume is then
The volume is then
First we will calculate the distance AB.
If C is 5/9 of the distance, mathematically speaking that means:
R: The coordonate of C is 15.
If C is 5/9 of the distance, mathematically speaking that means:
R: The coordonate of C is 15.