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What is the name of the engraved stone, discovered in 1799, that provided a key to deciphering the languages............

If 2 3 = 10 7 2 = 63 6 5 = 66 8 4 = 96 then 9 7 = ?

If xy is the number, the formula for answer is x(x+y) 97 = 9(9+7) =144

Ans 144. Add the two digits and multiply by first one, e.g. (2+3)*2.

Ans 144 :- 2+3=5×2=10;

What if 2 + 3 = 10 What if 7 + 2 = 63 What if 6 + 5 = 66

Then what does 9 + 7 = ?