Question 28
If the answer is not an integer, give the nearest integer. If the calculated answer has more than five digits, give its last five digits.
Integers $x,y>1$ make $20/x$ and $18/y$ fractions in lowest terms, and $20/x+18/y$ is an integer. How many ordered pairs $(x,y)$ are possible?
Integers $x,y>1$ make $20/x$ and $18/y$ fractions in lowest terms, and $20/x+18/y$ is an integer. How many ordered pairs $(x,y)$ are possible?