To find out what percent 27.5 is of 64, you can use the following formula:
\[ \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \]
In this case, the "Part" is 27.5 and the "Whole" is 64.
Substituting the values into the formula:
\[ \text{Percentage} = \left( \frac{27.5}{64} \right) \times 100 \]
Calculating the fraction:
\[ \frac{27.5}{64} \approx 0.4296875 \]
Now, multiply by 100 to convert to a percentage:
\[ 0.4296875 \times 100 \approx 42.96875 \]
Rounding to the nearest thousandth, we get:
\[ \text{Percentage} \approx 42.969% \]
Thus, 27.5 is approximately 42.969% of 64.