CD is the perpendicular bisector of both XY and ST, and CY = 20.
Find XY.
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20
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Since CD is the perpendicular bisector of both XY and ST, it divides both lines in half.
So, CY = 20, which means that SY = 20 and TY = 20.
Since CD is the perpendicular bisector of XY, CX is equal to DX.
Therefore, CX = DX = 20/2 = 10.
Since XY = 2 * CX, XY = 2 * 10 = 20.
Therefore, XY = 20.
So, the correct answer is:
20