Problem 1183
A new mathematical operation $ is introduced. If the new symbol $ produces the follwing results
8 $ 2 = 16
16 $ 8 = 4
15 $ 5 = 9
200 $ 40 = 25
40 $ 16 = 6.25
36 $ 9 = 16
8 $ 20 = 0.16
Find the value of 15 $ 30.
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