Solution
Given : 19 + 4 # 5 = 39 and 21 # 5 + 6 = 111
If we replace '#' with 'x', then we get the desired result.
Eg :- $$19+(4\times5)=39$$
and $$(21\times5)+6=111$$
Similarly, $$11+(15\times5)=86$$
=> Ans - (D)
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