What will come in place of the question mark (?) in the given number series?
15 27 37 45 51 ?
Even numbers in decreasing order are added.
15 $$+ 12$$ = 27
27 $$+ 10$$ = 37
37 $$+ 8$$ = 45
45 $$+ 6$$ = 51
51 $$+ 4$$ = 55
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