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If 3 + 5 = 21, 8 + 3 = 80, 9 + 5 = 117 and 1 + 3 = 3 then 6 + 4 = ?

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If 3 + 5 = 21, 8 + 3 = 80, 9 + 5 = 117 and 1 + 3 = 3 then 6 + 4 = ?
posted Apr 9 by anonymous

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1 Answer

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54


3 + 5 = 21 --------> 3*(3+5-1)=3*7=21
8 + 3 = 80 --------> 8*(8+3-1)=8*10=80
9 + 5 = 117 --------> 9*(9+5-1)=9*13=117
1 + 3 = 3 --------> 1*(1+3-1)=1*3=3
6 + 4 = ? --------> 6*(6+4-1)=6*9=54

answer Apr 9 by Hanifa Mammadov
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