Two consecutive positive integers have the property that one integer times twice the other equals 612. What is the sum of the two integers?

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say u take a no as x and the other as x+1. now according to question  x+1(2x)=612 x²+x-306=0 (x-17)(x+18)=0 so, x=17,-18. but for positive integers only 17 is the ans. so the nos are 17 and 18. edit