In the following question, select the related number from the given alternatives.
12 : 50 :: 18 : ?
The logic here is
$$\left(12\times5\right)-10=60-10=50$$Â $$\longrightarrow\ $$Â $$\left(\text{first number}\times5\right)-10=\text{second number}$$
Similarly, the required number =Â $$\left(18\times5\right)-10=90-10=80$$
Hence, the correct answer is Option C
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