Given : 3@7 = 20, 8@1 = 18 and 6@5 = 22
If we replace '@' with '+', and multiply the sum by 2, we get the desired result.
Eg :- $$(3+7)\times2=20$$
and $$(8+1)\times2=18$$ and $$(6+5)\times2=22$$
Similarly, $$(4+4)\times2=16$$
=> Ans - (B)
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