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GMAT Data Sufficiency (DS) | Re: Is the tens digit of a three-digit positive integer p

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Hey,

The natural initial instinct to this question, I suppose, would be to say that they are insufficient, which as you showed at the bottom, is easy to prove by plugging in some numbers.

I was wondering if there is a more strictly mathematical way of proving this without examples? I.E, having solving some system of equations where each digit in the number is a variable?

I'm not sure exactly what I'm picturing, but I just want to see a more concrete method than trying a few examples and seeing
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