Logical Question to Twist Your Brain

It is the very logical question which will twist your brain. In this brain twisting logical question, there are some equations. In these equations, some letters equate to the number logically. Can you find this logical relationship between these letters and numbers and then find the value of the missing number which will replace the question mark? 
IF OND = 11, UES = 22, EDN = 33, HUR = 44 and RID = 55 THEN UND = ?
Can you solve this Logical Question?
Answer of this "Logical Question", can be viewed by clicking on the answer button.

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