To determine which of the ratios is equivalent to 3/2, we can simplify each option and see if any of them match 3/2.
1 can be written as 1/1 which is not equivalent to 3/2.
2/3 cannot be simplified further and is not equivalent to 3/2.
To simplify 9/4, we can divide both the numerator and denominator by their greatest common divisor (GCD), which is 1. So 9/4 is already in simplest form and is not equivalent to 3/2.
To simplify 9/6, we need to divide both the numerator and denominator by their GCD, which is 3. So 9/6 simplifies to 3/2, which is equivalent to the given ratio.
Therefore, the answer is 9/6.