Bunuel wrote:
x and y are prime numbers such that 9 < x < 100 and y is the reverse of the digits of x, what is the value of xy?
(1) x - y = 18
(2) x + y = 44
Are You Up For the Challenge: 700 Level Questions
There are some serious fireworks going on in the question stem! Let's start there.
We know that x is between 9 and 100. That's a complicated way of saying that x is a 2-digit number. So, y will also be a 2-digit number. x and y are the reverse of each other, and x and y are both prime.
My rule
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